I have a buck 119 Special, 50 bucks at k-mart, super sharp (after I sharpened it) and would scare the piss out of anybody. Crocodile Dundee would be proud of this knife.

Also, Kabar makes my favorite knife.

Kershaw has some cool folding knives, as well as gerber. All pretty cheap knives (except kabar) and all are good knives for what you want.