need rb help, which trade should i do? WHIR

[jimmycaps08]

brandon marshal for adrian peterson straight up or marshal for ryan mathews and lance moore. should i even do either?
my offense:
Qb: eli manning
wr brandon marshal
wr vincent jackson
wr jeremy maclin
rb chris johnson
rb shone greene
te antonio gates
bn anquan bolden
bn bret celek
bn nate washington
bn deangelo williams
bn peyton hillis
bn matt shuab

[bmoors]

take AP and run, is this really a question?

[LWCrunner55]

Yeah I'd take AP and try to trade your RB2 for something else

[jimmycaps08]

obviously peterson looks like the obvious choice, its just whether i should still be worried that his knee will blow out again or cause him to deteriorate later in the year. also is moore an upgrade over the players i will otherwise be replacing marshal with (i.e bolden)