My first question is: What do you want to do with it?
A real survival knife is a knife that you have with you, that performs when you need it to.
A "survival" knife is probably what you are asking about. If I were a betting man I'd say you want something that you can chop with, baton, whittle traps, cut, etc... with--keerect?
My other question is: How big a knife are you comfortable using? Obviously you don't want something big enough that it feels ungainly in your hand.
The FK A-1 is a good knife. It'll serve you well and they've been proven.
The RAT RC-6 is a damned fine knife. The guys at RAT practice what they preach, so they know their stuff.
Tramontina Machetes are excellent for the money.
Ontario's machetes are damned fine too.
The Cold Steel Gurka Khukri is a good knife and you can get them at knifecenter.com for around 100 bucks (the SK-5 version, not the San Mai III).
Might want to check out the ATAX by Ron Hood, too. It's not an ordinary survival knife, he calls it a survival "tool".
HTH.
-Shawn-