I think it's premature for GSP to talk about moving up in weight class just yet. He still needs a rematch with Hughes and possibly Penn (IMHO I feel Penn won the last fight but it was close) and maybe a match with Diego Sanchez before moving up. If he manages to get thru those guys then GSP vs Silva will be a very exciting fight for sure. Some other fighters in the middleweight class that would make some exciting fights for GSP would be Dan Henderson and Denis Kang from Pride but I doubt that would happen. As for GSP in the LHW class, it would be tough for him to succeed with guys like Liddel, Rampage and with Crocop possibly moving down in weight it wouldn't even be close. One LHW fighter I would put my $$$ on GSP to win would be Tito.