i think Anderson Silva, just because he is ripping apart the LHW division, and i think this is the same as Penn moving up to fight GSP, Penn is a beast at 155, but he got rocked by GSP twice, just like Penn, GSP is a beast in the welterweight division, if he moves up, he may get pounded on, i would love to see GSP win, but i think Silva would beat him by TKO or Decision