Obviously Floyd, but Bradley would leap into my top 3, and Mayweather/Bradley would be the fight to make.
Floyd is already my #1. If Pac somehow loses to Bradley that doesn't necessary drop him anywhere on the list... Pac doesnt suddenly become a bum because he loses to a younger undefeated fighter.
Floyd. Obviously. The only real question is where do you rank Bradley. For me that would depend on HOW and why he wins. If he does.