Hey Streaker!
First and foremost let me start by saying that;
-I am by and far NOT an expert, in any way shape or form, nor do I profess to be.
-There are MANY on this forum who are far more knowledgeable than I.
-There are many engineers who can explain all the subtleties far better than I of design and steel make up.
With this in mind, I generally do not often put too much opinion forth on these matters - I always find it better to sit back and soak up the great knowledge provided by the members here. In your case, I'm making a rare sort of exception becaue there is some thinking that might be slightly obtuse that I wanted to stress to you and have you consider.
You've been presented with some EXCELLANT choices. The Busse Battle mistress and the Becker BK-1 "brute" being two of the most outstanding in the department of "world ending toughness", though damn near any knife that has been mentioned here is a monster in their own right and should not be consiered "lesser" by any standard.
I get a very real sense that what you're really trying to get at is that you want a knife that you could literally survive off. For that to be true, the first and foremost thing is Knowledge - making a spear out of your knife and some wood is easy if you know how and have the skill. So I'm not trying to be confrontational but consider it realistically; Do you know how to use that tool effectively? This idea/tool might be useless in the hands of the guy who is an accountant and has never left his office and has no training [his idea of "roughing it" being that they were out of dijon and he is having to make due]. On teh other hand some former special forced operator could use that combo to kill his enemies and dinner in the dark on new years eve with a slight hangover. A truly well trained man could probably make due with a 3" blade buck knife folder - not because it is what he would choose, but because it is what he had on him AND he had the skill to make it work. So proper training would be the better priority to me.
That being said, the better tool is always the better tool, and no one would choose to go into a situation as you describe with such a small knife if they could help it. That being said, I would put forth that one of the things I often hear from guys who have bought such huge knives is that once the shine wears off the apple so to speak, it became a really cool but ultimately huge knife that they don't find comfortable to carry for any real great distances. If you've ever carried a large 15"-18" knife while trying to, oh I don't know, say climb a rocky steep angle hill, it quickly wears you out and gets in the way. Likewise, as another member said, a $30 ax chops better than any $1K knife. So think about what you will REALISTICALLY both NEED and also USE [having a knife made to survive the hurricanes just might be overbuilt for the guy who lives in surburbia right? You might clear a tree after a bad storm - true - but you'll probably also walk back to the house and grab an ax or chainsaw to do that]. Right tool for the job and all. It's nice when a tool CAN be pressed into other roles in an emergency, but it doesn't absolutely HAVE to. The freed up space/weight of a smaller knife that is better at the chores it will face most often might then allow you to pack a small ax or even an e-tool in your bag [which makes an excellant shovel/axe/seat/you name it multi-purpose tool into and unto themselves!].
For the average guy going camping, or conversely, the average guy who wants a true survival knife [meaning that it will have to prep food, make camp, be used for defense, and help with the fire] You can make due with a much smaller, lighter knife, that will be less fatiguing, take up less space, and work better for the every day use. Could a battle mistress chop down a whole tree? absolutely. But I can use a KA-BAR USMC knife to cutt branches, make fuzz sticks & Fluff, and make a stick to roast my hot dog on just fine - hell, bigger branches can just be broken with my foot! and I'd never need to cut down ANY tree for any of these things. So you might perhaps consider something more in that size?
Steel choice is also something to consider - Some stainless steels and alloys are easier to maintian, but then again, is it truly hard to find 10 seconds to wipe off a blade? The Ghurkas have been using high carbon spring steel on thier Kukris for war for hundreds of years! I'm really fond of CTS-XHP, a great steel that has the resistance of stainless but has amazing edge retention without being brittle. My Hinderer Fieldtac is an amazing knife for what you're looking at doing and features this steel. The Duratech 20cv steel is great too. That being said, the standard carbon steel USMC knife worked wonders thoughout WWII and Korea and Vietnam! D2 Tool steel and Spring steels have been making some amazing knives for years too!
If you're wanting a truly hard use knife, I'd probably recomend somethign full tang with side scale type handles in Micarta or G-10 - admitedly the stacked leather of the traditional KA-BAR can rot if kept wet for extremely long periods of time, but then again we are talking a LONG time.
All in all, I hope this gives you some thought. If I were to boil down my absolute top five recomendatons, I could recomend, in absolutely no particular order;
Rick Hinderer "Fieldtac"
Fehrman knives "First Strike"
Becker BKT-7
KA-BAR Synthetic handle USMC
Justin Ranger [pick one - they are all great, though I REALLY like the afghan]
I see you're in my neck of the woods, so If you'd ever like to come check out my Hinderer Fieldtac, let me know and we'll see what we can arrange. Hope that helps! Best of luck - the serach for teh "perfect knife" never really does end, so We'll be seeing plenty of you around!