Fantasy league start.....?

I'm not really sure what to do with my running back status for my fantasy league. In my league we start two running backs. I have DeAngelo Williams, Cedric Benson and Steve Slaton. Obviously you start Williams, but who to pick out of the other two? Cedric is hurt but looking like he may play against the Browns....who he could dominate. Slaton is coming off of some sub-par weeks, and i never know what to expect from him. what do you guys think?