I'd love to see either Mosley or Berto. I'd lean towards Shane as even though he looked great against Margarito, he can't have too many more fights left in him - I think he would be good to go this summer or fall against Cotto, but much later than that age would play a far more significant role.
Berto is young and going to be around for a while, he and Cotto will almost definatley square soon enough, but Berto should take on Clottey and Cotto deal with Sugar - then the winners go at it to determine the top welterweight before the end of 2009.
Eventually I'd love to see Cotto get a rematch with Margarito, but it won't happen this year as it appears there is no way Cotto will aide Margarito in circumventing the Calif. commission ruling.
Clottey is clearly the best option.
I will be ok with Berto....unification is never a bad thing, even if Berto is a little green, he's still a threat.
Cintron I have a huge problem with.
I'd like to see Cotto-Berto. I think he would get more money as Berto has both a world title and is undefeated and from the US. HBO PPV would definitely pick that one up. Clottey would be a tougher challenge though.