I'm going with Seattle to repeat, by winning over New England in the Super Bowl.
I think NE will win the AFC over my Broncos because a:
-they have a much easier schedule.
-the Patriots/Broncos games is in New England AGAIN (funny how Denver has had to play AT New England all three years Peyton has been in Denver), and the home team always seems to win lately when Brady and Peyton play.
-The AFC title game, as a result, will be in New England.
Seattle will repeat because they still have the best all-around team, their offense will be even better this year with a healthy Percy Harvin, and I think Peter Carroll is a good enough coach to keep them motivated and fresh.