Palmer
Edit - Sorry, I probably should have at least reasoned why...I think that the Patriots biggest question marks are on defense, and specifically their secondary. And with Terrell Owens and Ochocinco on the outside, I'd have to think that they'll throw it early and often. Plus, I'm pretty sure Polamalu is healthy for the Steelers, right? He's as good a game-altering safety as there is in the game, so given the matchup, I'd go Palmer.