I prefer handmade, fixed blade knives for survival and combat. Better than the mass-produced crap i have found in recent times.
Check out
http://www.forgedknives.co.za/ I like the Puuko91...
I have some 6mm / 1/4" springsteel blades and when the time comes, i will ask Stuart, the knife smith, to make me some Puuko's for me, my wife and my dauthers. A matching set.
He heats the metal to remove the "spring", shapes (i will ask for full tangs to strengthen the overall and improve balance), drills, and sharpens the blades. Then returns the "spring" to the blade and finishes it in your choice of handle.
Imagine a hand-crafted 6mm, 1/4" thick, spring-steel blade on a custom made knife.
Excellent for carving or crafting wood or sticking into the neck or renal vein/artery of the enemy... Depending on choice of your attack.