I think a few questions need answering first.
1.) What are you trying to survive? Do you need to be able to cut your way out of an abandoned missile bunker? Cut your way out of an airplane that got shot down by grizzly bears with stinger missiles? A general bushcrafting blade that's just overbuilt so you don't have to worry about it breaking?
Most of the recommendations you get here will fall into the latter category.
2.) How much experience do you have with knives? If "not much" would be your answer, I'd stick to som eless expensive factory knives, rather than dive into a custom right off. Once you find what works best for you, then start in on the customs.
3.) How much are you willing to spend?
If you want a really good blade at a really good price, check out the RAT Cutlery RC line. The RC-4 was intended as an all-around woods blade. Or you can go with an RC-6 and RC-3 combo. Check out the RAT Cutlery forum here on bladeforums.
IF you want to up the ante a bit, you can go with one of the Busse family of knives. You can start with the pretty darn reasonable Scrapyard blades, move up to the more expensive Swamp Rats, or go to the "Oh my God, I spent
what on a blade?" Busse Combat knife.
For a less "tactical" looking blade, Bark River (BRKT) makes some really great knives. My favorite being the Aurora:
Althought BRKT aren't exactly inexpensive, they are worth what you pay.
Another gem I found for cheap is the Himalayan Imports (check out their forum here as well) R-10: