Who should i pick in my fantasy team?

I have Knowshon Moreno, Beanie Wells, Justin Forsett, Laurence Maroney, and Marion Barber as running backs. Which two should i start and why? And for receivers i have Roddy White, Hines Ward and Terrel Owens starting with Mike Wallace (PIT) and Chris Chambers (KC) on the bench. Is this a good decision?