Just to be contrarian, here's what I do carry as survival knives, on a daily basis:
--a Doug Ritter Mark 1 by Benchmade
--a Leatherman (primarily for the saw)
--a SAK tinker
I do a lot of outdoor work, and I'm in situations where I could end up at the bottom of a canyon with a broken leg, and not be found for a few days. The nice thing about these knives is that they "live" in my pockets and pack, and they're often being used, although never (so far) in a survival situation. However, they're tough enough to make a splint, help with shelter, peel some prickly pears, etc. While a khukuri would be comforting in that situation, I can't really justify it on an everyday basis, especially to my employers (I work in a park).
I bring this up just to point out that there are a bunch of different survival situations. I'm concerned about the "getting injured in the mountains and needing to be rescued" short-term survival situation, and so I'm always prepared for that. Wildmanh's situation of long term survival in the woods is very different from what I deal with, and it calls for different tools.
This doesn't stop me from buying (and using) khukuris, but I don't carry or use them on a daily basis.
F