Trade Advice: Stafford/Tate for McCoy/Big Ben?

[SultanOfSwag]

Hi everyone. I play in a 12 team league, standard ESPN scoring. Here's my roster:

QB: Matt Stafford
RB: Matt Forte
RB: Steven Ridley
WR: Victor Cruz
WR: Antonio Brown
Flex: Denarius Moore
TE: Antonio Gates
D: Dolphins
K: Nate Kaeding

Be: Ben Tate
Be: Peyton Hillis
Be: Nate Washington
Be: Mike Williams (TB)
Be: Felix Jones
Be: Jacquizz Rodgers
Be: Jacob Tamme

So I was offered a trade that I give up Stafford and either Hillis or Tate, and I get McCoy and Big Ben in return. I'm really unsure whether to make this trade or not. I'm 1-0-1 (yes a week 1 tie) which isn't bad, but my team hasn't been putting up many points (<90 both weeks). I hate to trade Stafford at his low value off 2 bad weeks, but this still seems like a good deal. With Forte out for potentially a few weeks, I really need a stud at RB. I'm a big believer that you need a solid QB to win leagues, and I don't think Ben falls into that category. But what I gain in McCoy should make up for losing Stafford I think.

So overall, I'm leaning towards making this trade more than not, but wanted some opinions first. If you think I should take it, do you think I should give up Hillis or Tate? Thanks for the help!