My pick is Ivan Calderon. He is very small and fights way bigger men then him and manages to beat them with his incredible skills... What do you think?
Floyd is the best boxer in boxing, not because of his power, but because of this skill. He is easily the best boxer in the sport. Pure Boxer. Cory Spinks is very high on that list as well. For me he is number 2.
I've voted for Mayweather, who is very skillful, but had Joe Calzaghe been on this list, he'd have gotten my vote. I don't think anyone has beaten an undefeated champion (Lacy) so completely - And don't forget he was meant to lose that fight!