Buck Vantage Select (large) paid $30 new
Good blade shape, secure lockup, comfortable grip, respectable steel, excellent deep pocket carry clip, and the flipper is a barrel of fun.
The Select (small) is also pretty nifty, too small for my big hands but maybe right for others. Usually, I remove the pocket clip on my knives, but this is an especially well designed one, so I keep it on. Carries great. Lately, this has been my go to knife for work.
Spyderco Delica paid $50 new
I can't add anything new to this knife's reputation. It's a classic, and deservedly so. I carry mine without a clip.
Spyderco Native paid $30 used
I can't decide which I prefer, so I alternate between this, also without clip, and the Delica for out and about carry.