For the money, a CRKT Drifter is hard to beat.
Smooth opening, trim, I like the cutting efficiency of the recurve blade, all in all an excellent EDC knife.
For heavy duty/ Tactical use the Ontario Rat 1, I absolutely love mine.
If you like classis styling go for an Opinel, the 6 is very nice and small, but the 8 is my favorite one. Or, pick up a Rough Rider SlipJoint, they make excellent slipjoints in a variety of patterns, most can be had under $15.
And for a dependable woods folder, the Svord Peasant knife is a great knife, most of mine came a bit dull out of the box, but if you can sharpen a knife well they are an excellent option.