I would pick either Williams or Tate, although it seems that Tate gets a lot of goal line work so he will end up doing better. Bush only really plays when DMC is down so I would avoid that.
ESPN 12-team Standard Scoring
QB: E. Manning, Manuel
RB: Richardson, Murray, G. Bernard, Tate, Powell, Woodhead
WR: Bryant, Fitzgerald, D. Jackson, Britt
TE: Davis, Cook
K/DST: Hauschka, Dolphins