Marion Barber..do I still need him?

I've got Frank Gore, Thomas Jones, and Cedric Benson. All 3 have been producing fairly well this year. I only have to play 2 each week. Barbers been pretty much riding the pine. Should I hold onto him still or perhaps see if I can trade him for a better receiver? Receieve wise I got Boldin, Desean Jackson, Hakeem Nicks, and Sims Walker. Think I need someone a little better than them 4?