Right now, the knife I'm having a love/hate relationship with is the Coldsteel Rajah 1. It's an amazing knife for all the wrong reasons.
It's giant, which oh so bad-ass, but very not practical for pocket carry. It's fun to chop with, but a folder isn't the best tool for that job. It could really hurt a bad guy, which is something I hope I never have to do. Lynn Thomas can be a jack-ass sometimes, but Andrew Demko seems know the deal. It's list price is an insult, but I got it for pretty cheap.
All in all, the Rajah is my guiltiest pleasure.