HW: Fedor E.
LHW: Chuck Liddell
MW: tough one for sure.... Anderson Silva
WW: BJ Penn
LW: Mac Danzig
I'm selfishly listing BJ at WW although he hasn't fought there recently simply so I can use my LW pick for mac and I don't have to put GSP or Hughes.
It doesn't matter if you don't like them; Anderson Silva and Floyd Mayweather Jr. are the best at what they do and it's not even close. The only way to shut them up is to beat them in the ring.