NRG,
if your making a survival kit I would suggest you consider using a good SAK, like the victorinox rucksack. I worked in survival equipment for 8 years, active duty Air Force (88-96, desert shield/storm). I have to say after 8 years of experience in survival equipment a SAK is a pretty good choice. The tools are important, but they are only as "effective" as the person using them. Big knives make poor survival kit knives as they tend to become more of a nuisance. Please do not mistake this, big knives are useful, but in a survival situation you want something that will not be cumbersome, or heavy to carry around.
Im only speaking out of my experience. Ive seen guys survive on small kits that will fit into a 1 1/2" x 4" pouch and contain a cheap 3 blade colonial stockman. It seems that many (Im generalizing this) think you have to have really nice, expensive knives in kits, not necessary at all, why spend the money if there no need for it?