Bears fan here. Won't be offended if you dismiss this prediction.
The Bears wins have all been big this season. Only two of their wins have come by less than two TD's. One was Carolina (Steve Smith absolutely kills us every single time), and the other was a 6 point win over Detroit. Cutler was dinged up in the 2nd half of that game after getting completely crushed by Suh, and it affected playcalling down the stretch.
I said this on a 49ers message board on the week of the 49ers game, and it goes for the Seahawks as well. For the Seahawks to win, the first quarter is very important. The Bears play their worst football in the first quarter. Cutler is bad in the first quarter usually, and it takes the offense a while to find much traction (if they ever do). If the Seahawks can take advantage and get ahead, they'll be in good shape.
However, the Bears defense, most of the time, covers for the offensive struggles, and gets an early turnover or two to allow for some cheap points. The Bears play very well from ahead. Cutler and the offense are very good at piling it on when they have a lead. If the Seahawks are down early, they'll be in trouble.
Looks like we're going to be missing two O-lineman for the game, but the O-line has been pretty bad all season, so no huge loss.
I'm picking the Bears big, but it's mostly because of the Seahawks road troubles. I'd have much more trouble with my prediction if the game was in Seattle. I think the Bears win by a couple of TD's and a FG. 31-14