Which one of these fantasy players would you pick to start at WR/RB?

Hi, I have an nfl fantasy team, and I was wondering if anyone could help me out on who to start for me as WR/RB. I have 1 slot remaining that can go to either a running back or wide receiver. The players I have and am considering putting in the starting lineup are Jahvid Best RB, Santana Moss WR, Dwayne Bowe WR, or Marion Barber RB. Please give me your opinion on who you think should be on the starting lineup.