Wow, lots of the more recent posts are guys I'd consider 2nd or 3rd tier funny, the Gaffigans, Martins, Tosh, Black. Those are funny guys, but if I had $40 in my wallet and could only see one of those guys perform, or go see Cosby perform, I'll be at the Cosby venue every single time.
I left Joe Koy out of my hack list (with Dane Cook, Mencia, Dunham, etc). I friggin hate that guy.
Also surprised a guy I personally don't like, but lots of my friends love, Russell Peters, hasn't been mentioned.
A much lesser known guy that pretty much make me laugh every time is Ryan Stout (YouTube him)