Your are going to get a lot of different opinions here on what constitutes a "survival knife". There are three more pieces of info really needed:
Price range your looking at.
Size of blade\weight of blade your wanting\willing to lug around.
Type of task you envision using it for - just "survival" is too vague. For some people a 3" Mora is a survival knife and anything more is excessive, for others a 2 pound chopper that could be used to build a log cabin is what they consider a survival knife...
Price range: I'm one of those buy once, never worry about it again kind of guys. Here's a small example of what I mean. Personal use AR-15: top of the line, custom built, costs $1600 initially, but I never have to worry about it breaking. Handgun: HK USP Tactical. Been through so many torture tests that it's got me convinced it's unbreakable. Price isn't so much a problem as long as it's worth what I'm getting out of it.
Size/weight: once again, not too concerned. I'll drag around a 15 lb. knife if you can convince me that the 15 lb. is worth every ounce (this is exaggerating of course, but you get the idea).
Task: anything from personal defense in case both my primary and secondary weapon systems fail me and as an overall tool for cutting 550 cord to opening my beers (don't worry, I use the spine).
I've checked out every brand mentioned here and there's a few that really stick out. Also, after hearing that my SOG is far more adequate than I initially suspected I may just stick with it. On the other hand, why waste a perfectly good reason to pick up another hobby and buy another knife
Thanks for everyone's responses, you guys are great.