Need some advice

[JaeTM]

After Colston went down last week my WR took a huge hit because he was my only legit WR. I'm looking to trade Shonn Green for a wideout. Every time I ask Yahoo to "evaluate" my trade it seems that the other person is getting the short of the stick pretty badly. What would be a fair trade for Green in your opinion? Someone in my league is looking for a back and is looking to trade Wes Welker? How would that be?

Also, another person in my league has Peyton Manning and because he's out he needs a QB. I have 2 good QB's in Flacco and Ryan. Should I trade either of these two for Brandon Marshall? If so, which should I try and trade, Flacco or Ryan?

Thanks!

EDIT: My roster is:

QB: Matt Ryan
WR: Austin Collie
WR: Michael Crabtree
WR: Davon Bess
RB: Adrian Peterson
RB: Fred Jackson
TE: Antonio Gates
BN: Joe Flacco
BN: Marques Colston
BN: Chris Cooley
BN: Shonn Greene

K: Neil Rackers

DEF: PIT

[JaeTM]

I went ahead and offered Shonn Greene for Wes Welker and he denied the trade. What kind of WR is acceptable to get back for Greene?