I'm going with Colts and Panthers. Colts are too hot as pointed out here a few times, I do think the Patriots can stop the Colts and Manning but come on, Manning seems like a man on a mission, and his rating in the last two games is NEAR perfect (150ish).
Panthers are riding on a feel-good upset of Rams and I see them gaining more confidence. As someone said here, as long as Carolina does the time of possession gameplan (hand it off to rushers), I don't really see any reason why they should lose.