Colts.
This isn't just Manning homerism, I think the Colts will win by two touchdowns for several reasons.
1. The AFC kicked the NFC around this year
2. The Colts should be loose after finally taking out their playoff arch-rivals
3. Since the Indy run D is suddenly great, they should make Grossman do more than manage the game. That is always bad for the Bears
4. Peyton Manning
5. The colts are only young at the positions you can afford to be young at: Running Back primarily
6. Dungy made Lovie Smith (although I wish Lovie the best considering he coached DBs at UT)
I could go on, but I think the point is made.