I don't really root "for" anybody other than the Steelers, but here is my list of order of preference (from least objectionable to most objectionable).
1.) Broncos - See Elway eat his Tebow words and give him the trophy/hug on the platform.
2.) Texans - Underdog. First Playoff appearance in team history... with 3rd string QB
3.) Giants - it might be funny to see Eli with more titles than Peyton
4.) Saints - Don't like the town. Might be cool to see Sprole get one after he leaves the Chargers.
5.) Rats - Hated division Rival.
6.) 49ers - I don't want anyone to get 6 Super Bowl wins
7.) Packers - I don't want anyone to get 3 Super Bowls in a Row. So I don't want anyone to get 2.
Cheaters - as long as Belicheat and Brady are there and arrogant Boston people still live, they will be at the bottom.