Silver Surfer vs Thor would be another thread.
This is one battle that could go either way. Afterall, the Surfer was knocked out by the Thing in his first appearance. Certainly if Thor got an "Unfettered Might" hit on the Surfer, it would be all over. Then again, the Surfer certainly has the speed and agility to avoid most of Thor's attacks and has enough power to put a hurting on Thor.
Aside from SS Vol I issue 4 have they fought?
BTW you guys see the Exiles alternate Earth Silver Surfer take on the Imperial Guard recently?
Cool stuff.