I went with BJ with Werdum being a close second. I'm not going to beat a dead horse about Maia or Roger either. Of the choices given I'd take BJ pound for pound, if they all grappled each other regardless of wait, Werdum all the way.
Favorite Fighters of all time: Ken Shamrock, Fedor, Guida, Barnett, Mayhem, Hendo, Cro Cop, Wanderlei, Evan Dunham, Big Nog, Sonnen, Penn, Condit, Bader, Evan Tanner, Matt Serra, and of course, Chuck.
Least Favorite Fighters ever: Lesnar, Tito, Shields, Evans, Koscheck, Mir, Maynard, this new Anderson and Aoki.
I hate Lesnar now, I hated Lesnar then, I will always hate Brock Lesnar.