A few considerations.
1. The "Tracker," in all its incarnations, costs a lot of money. Redscorpion6 seems to have his version on offer here on the forums for a discount.
2. One consideration is going to be that the likeliest way for you to end up suddenly knifeless is probably not that the knife you choose will fail, but that you'll lose it, drop it into a lake, etc. This can happen with a $500 knife just as with a $2 knife. Given that knives are so crucial as parts of one's survival gear, you may be better off with three inexpensive knives than with just one super-expensive one. If you just have the one (due to weight, expense, etc.), and it snaps, or gets lost, or sinks with the airplane whose ditching is the cause of your survival situation, or is confiscated by somebody after a disaster, you might have been better off with a bunch of knives. In a lot of survival situations, you might also like to have extras to give to friends, to trade, etc.
3. The "more than one knife" theory of #2 above also conduces to keeping a few of different kinds, so that you can keep a couple of different kinds on hand to deal with different tasks.
4. One thing you'll notice in the survival literature is that different instructors have radically different ideas about what a likely survival situation will look like. Famous Australian survival guru R. H. Graves opined that a machete would be about the most useful bladed tool, but his main idea of a likely survival situation seems to have involved the Australian bush, Indonesia, and/or southeast Asia. If you are planning on day-hikes in the desert, or survival on the Alaskan tundra, or time on a life-raft on the open ocean, you'd probably be a lot better off with a smaller knife.
5. The most important attribute of any survival knife is that it actually be with you when your survival situation happens. Pocketknives are good this way, since they're likelier to be something you have on you when disaster strikes; relatedly, people don't tend to flip out when they see a Swiss Army or Boy Scout pocketknife in the way that they might if you had a Ka-Bar Bowie with a 9-inch blade. Really big knives have a nasty tendency to get large amounts of money paid for them, only to spend most of their lives in safes or closets, because they're too heavy or unwieldy for realistic use.
6. I think the single biggest problem with a survival knife would be for it to outright break. I would much rather have my knife rust, or bend, than break. That means that I usually trust high-carbon, non-stainless steels more than any kind of stainless, D2, etc. If I were living in a place where non-stainless steel rusted in hours and took the sharp edge off my knife constantly, I might think differently--but I don't.
7. Many fans of small knives for survival purposes recommend that you cut large pieces of wood, etc. by pounding your knife through the wood with a big wooden club. This works. It can work amazingly well. There are a couple of problems, however: (1) this subjects the knife to a great deal of force, and even quite decent knives can fail catastrophically if this is done to them. Before doing this with your one knife out in the woods, ask yourself what you'll do if you find yourself holding only a handle; and (2) it requires that you have two available hands--something that might be a problem if you're injured, or, say, if the piece of wood you wish to cut off is a high tree branch you'd like to use to make a bow. If your cutting method involves using both hands, but your situation requires you to hang on with a third hand, you may find yourself wishing you'd brought a saw, or a knife big enough to chop. The small, almost-disposable knives made in Mora, Sweden (good selection available at
www.ragweedforge.com , under the Swedish Mora knives sub-site) are favored by many outdoor survival experts, and they cut very, very well, hold up to medium-hard use, are light and inexpensive, and don't trigger as many people's "this guy is a homicidal nut" reflex as do more military-looking knives. They're a great choice for most survival applications--but they do have a bit of a history of breaking under extremely abusive use (which probably includes batonning through big chunks of wood). Survival instructors Cody Lundin and Mors Kochanski seem to swear by them, and someone on the forum wrote that even Tom Brown, who is claimed, I believe, to have designed the "tracker" model, sells Mora knives to his survival course students.
8. Thick knives are, ordinarily, harder to snap than thin ones--but they also tend not to slice as well. This can be addressed by keeping one thick and one thin knife in your kit.
9. Most survival equipment is actually going to see use just doing basic handyman things around your home or office or car--unless you really keep a totally-dedicated, sealed "SURVIVAL KIT" somewhere. I keep a Leatherman Wave in my briefcase, which usually is within 50 feet of where I am, wherever I go. Among its most common uses are pulling staples from large stacks of paper, trimming fingernails, and opening packages--but it's very much part of my everyday emergency-preparedness gear.
Some of my favorites are these.
1. Leatherman tool -- I like the ones that have a saw and scissors, since I use these all the time. There are better knives than the knife blades on Leatherman tools, but I find the overall multi-tool thing so handy that it's got to be among my first choices. Tweezers are also very useful, and at least one of the "Juice" models has these.
2. Swiss Army knife -- see above; again, I like the ones with saws and scissors. Tweezers are also very useful--I probably use these about every two weeks. (Lots of cactus and splinters out here.)
3. Ontario "Old Hickory" knives (or, very similar, Russell Green River Works knives in high-carbon steel). These are thin, slice nicely; I've heard stories of them being broken, but I myself have subjected them to spectacular abuse, up to and including clamping into a vise and leaning on them as hard as I could, trying to break them, without doing so. I'd predict that they CAN be broken, but they are basically fairly tough, at least, and, best, are extremely inexpensive. At any given time there are usually dozens for sale on eBay, used, for as little as $2 or so apiece. They are light. They take a great edge, and can hold it at least okay. Many of them are full-tang, with wooden handles attached to a full-sized steel tang with rivets. This means that they're a lot harder to break at the tang than other knives with narrowed tangs. Possibly the best bang for your buck out there.
There are entire Native American TRIBES in my state with only a few hundred people each. For a little perspective, you could give an Old Hickory knife to every man, woman, and child in one of these small tribes for the price of ONE high-end Busse knife. You would still have a few knives for yourself, even if you lost a couple, and you might end up with a few hundred friends to help you out in your survival situation.
4. USAF pilot's survival knife. These have been made by Ontario and Camillus. They are of 1095 high-carbon steel, and have blades usually 5 inches (rarely, 6 inches) long. Designed to help the user saw and hammer his way out of a downed aircraft. Lots of people hate the saw back, but I find it useful for cutting through small pieces of wood; some like it for cutting notches in sticks for making traps. The blade is pretty thick, which means it's harder to break than some--but it's also awkward for fine slicing. It's got a hammer-like hexagonal pommel which you might find useful as a replacement rock from time to time. The sheath often comes with a little sharpening stone in a pocket on the front. The leather handle and sheath might or might not be a good idea if you're in very wet environments where it might rot, or very dry environments where it might crumble into dust. I got a bunch of these for my wife and kids, who all have small hands, as the handles on these are thinner than on some knives like the full-sized Ka-bar USMC knives.
5. Mora knives--recently, the main makers were Frost's and Eriksson, but I gather these have merged into a new company called "Knives of Sweden". Hard to go wrong here. Visit the "Ragweed Forge" site mentioned above and browse. Some people love the Mora 2000 (big, stainless, nice handle, but costs 3 times most Mora knives, probably without being 3 times as good). I like the carbon-steel Clipper model (nice, very securely grippable rubberized handle), the Craftsman in triflex carbon steel (differentially tempered, so the edge is hard and holds better, but the spine is soft and resists snapping), and the classic wooden-handled ones. I hear that the laminated ones have a nasty tendency to bend. If you get one with a slick plastic handle, consider roughing it up with coarse sandpaper for a better grip--you'd hate to put your knife through your hand, or drop it through your foot, after its handle gets slippery while you're cleaning the fish you just speared.
6. Cold Steel's Survival / Rescue Knife (SRK), in carbon steel. I don't think they make them in non-stainless anymore. This is a thick, tough, no-nonsense knife. A bit thick for fine slicing, but you can do it. Another knife that has quite a following, though I've never had one, is Cold Steel's Bushman--which seems to be virtually indestructible. (I've read about one lot having had problems several years back, but, at this knife's low price, just buy one, subject it to some heavy prying, and, if it doesn't break, you probably got one of the majority that are almost impossible to destroy.) Some people stuff the hollow handle full of survival gear and cap the end with a crutch tip.
Larger, chopping-oriented knives.
You may or may not really need one of these. Lots of debate on knife size here and in the survival-school world, and a lot of it will depend on what you're going to need to cut. Realism is good here. If you decide to try one, consider these.
7. Ka-bar "Large Heavy" Bowie, model 1277. Flat grind makes it a better slicer than a lot of big knives. It's long enough (9-inch blade) to actually chop quite respectably. Comfy rubber-like handle. In spite of the "heavy" in its name, it's actually lighter than a lot of Bowies. You can get this without much trouble for under $50 via eBay. Very underrated, in my opinion. There's a shorter-bladed model, too.
8. German Bowie knives from Solingen. I'm talking about the carbon-steel ones from companies like Edge Mark or Edge brand. Not too sexy, but they worked just great for your dad and grandpa, and will work for you, too. You can get a full-tang, high-carbon blade up to 10 inches for about $50 if you shop eBay for a while. Also very underrated.
9. Ontario Knife Company's "Survival Bowie" and "Marine Raider" Bowie--I like the latter. It's got a very tough, saber-ground, 1/4-inch blade. It's heavy, built like a tank. Kind of unwieldy, but hard to break (except for the pointy tip). Sheath is flimsy and sucks. The "Survival Bowie" I trust less, because its flat grind makes it much lighter and prone to breakage. However, the same shape means that it slices much better than the Marine Raider. You might also consider the RTAK or RTAK II, which at least WAS made by Ontario for a while; never had one myself, though.
10. RD-7 or RD-9 by Ranger Knives. Available at
www.rangerknives.com or
www.actiongear.com . I've never even held one, but they come very highly recommended. They'll set you back about $70-120, depending on where you buy. Word is that Justin Gingrich, the US Army Ranger who makes them, is about the best customer-service guy you'll ever run across.
11. Himalayan Imports khukuris. These are hand-forged by smiths in Nepal, and differentially tempered so that the primary cutting part of the edge is very hard and holds an edge well, and the rest of the blade is comparatively softer and tough. Lifetime guarantee to the original purchaser. The super-tough-and-thick chiruwa ang khola has an unusual warranty: bend or break it, and they'll send you TWO replacements. I gather this doesn't happen often. These knives retail at H.I.'s online Yahoo store for $100 and up, but lower costs are available on a near-daily basis if you just lurk around the H.I. sub-forum on BladeForums, note the time of day when the proprietress, Yangdu, posts offers of bargains, and then instantly e-mail her your acceptance of an offer that strikes your fancy. (Best deals are typically snapped up within 10-15 minutes of posting, sometimes much sooner.) You can usually get a very good knife this way for as little as $70, give or take, especially if you don't mind a cosmetic blemish like a bit of rust or a small crack in the handle. Each khukuri comes with a little fixed-blade companion knife called a "karda", with about a 2-inch blade, so you instantly have the small cutting tasks covered with one of these. Good models are British Army Service (10 inch blade, 15 inches overall), sirupati (variable size), and the various kinds of ang kholas (also variable, chiruwa model with the most-robust tang tends to be about 16.5 inches overall). Khukuris tend to be thick, awkward at slicing, but great at chopping. Rather intimidating to walk down the street with, and their bent shape makes them look a little pistol-like at first glance. The chiruwa ang khola, while very hard to destroy, has a blade that can be a full half-inch thick (yes, you read that right--1/2 inch thick) at the thickest part of the spine. This makes for a heavy knife, and not the easiest thing to use to filet a rat or a small fish. Some people swear by the World War II model, but I find the point to be blunt enough that I prefer other models. Customer service is the best I've ever seen. Anywhere.
Nice thing about khukuris is that you can get quite a lot of chopping power in a fairly short package. These hand-forged knives have much more character and conversation-piece value than any factory-made knife you'll find. Browse the internet for Cliff Stamp's reviews of these, and you will be impressed with the kind of abuse they can endure.
12. Reflections of Asia bolos. These are also hand-forged, this time in the Philippines. Less polished and pretty than Himalayan Imports' stuff. These are bolos--thick, big, long, machete-like knives, forged from truck springs. Handles are wood or, more usually, water buffalo horn. You may need to sand/shape the handle for optimum custom comfort. I hear that they are also differentially tempered. Go to
www.reflectionsofasia.com, use the search function for "bolo", and shop to your heart's content. I think the price on these has gone up to about $25 apiece plus shipping from California.
Have fun!