I, for one, think you have two great choices there. Both matchups are good and I think Brad is due for a BIG game and Kitna's hand is just too hot. By a nose, I would go with Kitna. I just do NOT see Pittsburgh's pass defense holding up two weeks in a row. I think Kitna & Co. will scorch them. Don't be surprised if BJ has just as good of a game, though.
Over the past 6 weeks, Tampa has averaged only 16 points a game with Johnson throwing more INT's (9) then TD's (8). Over that same period, Cincy has averaged 28 points a game with Kitna throwing 13 TD's to only 3 INT's. Go with the HOT hand. Kitna is your man. Good luck!
The Bengals have won only 2 out of the last eight in Pittsburgh. Kitna played poorly in the first meeting against the Steelers and generally struggles in Pittsburgh. Its a what have you done for me latley world though. Id play Johnson.