I'm going for the Steelers for 2 reasons:
I'd like to see the Bus win one...and...
I'm strangely mesmerized by Big Ben. He doesn't appear to be all that great. His stats never blow my mind (Peyton Manning, McNabb, Montana, Young, Aikman, Favre, he's nowhere near any of those guys) but this guy just wins and wins and wins and wins.
Even last year when they were talking about how much he was winning - you'd look at his stats at the end of the game and he'd have 179 yards passing, 1 TD, 14 rushing yards. It's like watching a really slow train wreck. Nobody's getting hurt, nothing spectacular is going to happen when they collide, but at the same time you are just curious enough that you can't take your eyes off it.