I have Jamaal Charles locked my RB1 spot. Who do I go with this week?

Tate (4 cracked ribs, but Arian Foster is now out)
Bell (Lions defense is giving up the fewest FPPG to RBs the last 5 weeks, but is the only run game on the steelers)
Ridley (return of vereen + panthers defense - but has been a beast the past 4 games)


Who would you pick?