Five RB's enter....Three leave

Ok so I have Arian Foster, Fred Jackson, Peyton Hillis, Rashard Mendenhall and James Starks. FJAX is a lock. So who else should I go with? I see them all very close in terms of merit. Arian Foster, will he back to 100%? The Steelers run defense is looking shaky. Peyton Hillis is back this week after strep throat but will Hardesty steal carries? and also the Titans are pretty good against the run. Mendenhall has been a let down this year so far. Finally, Starks is getting the start against the Broncos. So who should I roll wit?