I have had a couple specwars, a nimravous, and have had experience with the seal 2000. Crowbars are about the toughest things around, but they cant cut worth a damn, that’s what I'd say for the seal 2000, why would you put serrations on the part of the knife you use mostly for carving? And what is it made out of, 440c, I mean common.
The specwars I loved, but they are not really the most user-friendly knives. With the chisel grind they can be awkward to carve with, and the full chisel grind is difficult to sharpen in the field, forget taking a chip out of the edge, you've got to remove ALOT of metal (did it once when I got it back from a friend who had “bought” it but never paid, he decided to test the strength by cutting some cinder blocks, great idea), I think I did break a small bit of tip off one of them too. The handles on the speckwar are some of the nicest I've come across though.
My favorite by far has been the Nimravous (with the M2 blade) sure its not the most pry bar like knife, but it sure dose cut beautifully, has good balance, a great utility blade shape that’s the right thickness for most carving / cutting jobs, a comfortable and precise handle, and HAD a great sheath (bring it back benchmade!) the most abusive thing I've done with it is baton it through wood to split it, witch it held up fine for. The M2 doesn’t have the best reputation for shock resistance, but it takes and holds a great edge. My theory is if you have a knife in a survival situation, your most important tool and that witch your life depends on, you wont go digging a hole or prying rocks with it, or using it for anything that could potentially break it, you'll be careful with it and use it for what a knife is intended, and in that respect the nimravous is a great knife.
I have a fair bit of experience in survival type stuff (tom brown's school and the Wilderness survival school) and I've never found the need to do super abusive things with my knife, batoning it through wood is about the most. In my experience its much more useful to have a fine and precise cutting tool than a heavy and awkward pry-bar like knife, there is allot of detailed cutting to be done, much more so than all sorts of chopping this and digging that. Of course ideally I would have 2 knives, and one of them would be big and heavy duty, but I'm sure I would use the smaller one 80% of the time, and if it came down to choosing one, I'd probably take that.
As far as the other knives your considering, they don’t look as though they are the most versatile designs, and the stryder specifically doesn’t appear to have the most comfortable handle for extended use, think hot spots! My hand hurts just looking at it! I'll put in my vote for the Busse of course if price is no object and you want the toughest (I've got 2 FBM's on the way), but along with the Busse I would definatly carry a nimravous (they make it in D2 now, and i think they brought back the G-10 handles, they were aluminum for a while) or a bark river, my freind has one and its verry much a user knife, nice geometry and grind, good steel, cant go wrong.
.). Get a Busse Steel Heart or Battle Mistress and the Bark River of your preference (I recommend the Kephart 
), follow this up with a Vic SAK of some form. All the bases are covered with a combo like this and the extra weight using a SAK Huntsman and BR Kephart is roughly 10 oz.
