As a fan I'd like to see Cotto, but that's probably the hardest fight for him. If you mean from Floyd's perspective I'd say "retire" and then when another boxer becomes a superstar come out of retirement and make another fight with 'em
PBF will fight Cotto. It will make a lot of $$$, and he is confident he can beat him. Tszyu isn't coming back, and Mosley just lost (well, so had Zab when PBF fought him). I think this is PBF's next fight, and I think he will win it.