I agree with your tip for the AFC, I think the Colts will scrap through and finally get past the Patriots into the big one.
In the NFC, I would not be at all surprised to see New Orleans get through. Rex Grossman is going to be under an immense amount of pressure, and he might be due again for one of those brain explosion games. Also, the Saints ground game and been rolling, and the freezing conditions in Chicago will suit that. Also, do not discount the "good feeling" the NFL will get should New Orleans make the Superbowl. I think the Saints may get a little "help" from the officials. It would definitely make a good storyline. So other than it being a fix, I think it will come down to how many many big mistakes Rex Grossman makes.
Cheers
Rick