Doug:
To my knowledge, there are no obstructed seats in PBS.
Regardless, I just called into the ticket office (was going to go down to the stadium today, but saved myself a trip) and ordered 3 seats for section 314, row 14 for $50 each (total was $154 after shipping).
You can see the stadium map at:
http://www.bengals.com/tickets/stadiummap04.htm
You should, however, have no problem finding tickets the day of the game. This matchup isn't exactly getting people excited down here (with the exception of the opportunity to boo and yell at our boy Takeo), so there should be plenty available. Just get to the tailgate early, and you'll see plenty of people selling them in the lots. Otherwise, they're lined up on the walk to the stadium.