The only knife I regret buying is the Gerber 3.25 AR, but then again it was a good learning experience. I'm not a fan of the LM Wave that I got as a Christmas gift, but I will say that I like leaving it in the car and it can come in handy at times, so I really don't regret it, and it's better than leaving something I'm apt to carry a lot in there like one of my SAK's, plus the pliers could be a good thing to have. So really, just that Gerber. And any of those CCC SAK's I bought years ago...:barf:
My happiest purchases would probably be my Delica, Vic Compact, Vic Super Tinker, and Brian Goode fixed blade.