I would start Barber and Rice. Outside of dramatic story lines they're your two best RB's. Start your stars.
I get the LJ thing but if you start him you're relying on Marvin Lewis' desire to let his backup RB rub it in KC's face, despite the circumstances of his departure. I'm not sure that I would trust that he does this. If you do start LJ I would do so more on the possiblilty that Cincy has taken the black armband off and have decided to play like men on fire this week.
Of what's left, Harrison is tempting but you're chasing last week's points on a team, despite the matchup, you can't really trust to perform week after week, which is what you need in the playoffs.
Dramatic switches are tempting but slow and steady wins the race.