I like my cheapie American made Bear MFG model 703, it's a stainless 3 inch lockback folder.
I've had mine for five years now and have abused the shit out of it, it's the knife i learned how to sharpen with, i clumsily removed the ricasso with a grinder, just because I think they get in the way. I also removed the secondary bevel and changed the grind on the knife to a flatter steep convex grind for better robustness with the softish stainless steel. Because of it's size and untactical appearance I can carry and use it anywhere and nobody cares since it doesn't scream **DEADLY WEAPON** even though it's hair poppin' sharp. So it's been my EDC along with my Leatherman Wave. I removed the clip and it rides in the nylon velcro pouch with the wave. It's the knife i reach for first whenever I want a knife because I'm not afraid to fuck it up, though it's been surprisingly rugged considering all the stupid things I've done with it like batoning, just to see if it could to make kindling and tinder in one stick / wet fire conditions, it did well provided the stick wasn't much bigger than my wrist, the lockback is pretty solid.
I paid $25 bucks for it at Ace Hardware years ago, you can get it at knifecenter now for $17 bucks.
http://www.knifecenter.com/item/BC703/Bear-and-Son-One-Hand-Opening-Folder-w-Zytel-Handle-30-inch-Closed 