Fantasy football question?

Who should i start this week for my rbs, i am starting cedric benson on my 1st running back spot and i am trying to decided between BenJarvus Green-Ellis who is going against the miami , Kenneth Darby who is going against the seahawks or Mike Tolbert who is going against the cardinals but idk if mathews will be back. Who do you think would be the best choice? Thanks for your answers