As much as I'd like Seattle to win...I have to agree with you on this one coy. Pittsburgh stepped their game up for the playoffs and beat a team who pounded every great AFC rival in their path during the regular season. Seattle's lost games during the regular season (I never count the last 2 games with conference champs) include some of the weaker playoff teams, Jacksonville and Washington. Their other victories were against crappy teams: San Fran, St. Louis, Arizona, Tennessee, etc. Pittsburgh went 1-1 with many playoff teams, and rose from last in the AFS playoff ranks to first while playing on the road. Bettis will probably be the Detroit favorite but even if there are not many Detroit folks there I suspect Pittsburgh will have the crowd advantage.
The Seattle defense is talented, quick, and smart, but they are small...stopping the Bus at what is sure to be his most dedicated performance will be difficult.
All that said, I want Seattle to win...I like the Steelers but I'm not liking their fans too much (lived there for a while). Seattle is overdue for some good news :)