I would imagine that a knife would be your weapon of last resort. So I think the "survival" part is key.
Where would you need to survive? Urban? Woods? Desert? Mountains?
For "urban" I'd say Ranger RD4, for "woods" I'd say Bark River Fox River or Bravo-1.
Also, serrations are difficult to sharpen anywhere, let alone in the field, so I'd pass on them.
And, in any situation, get a Leatherman with a saw blade.
| "Why use an ox-cleaver to carve a chicken?" - Confucius|