Roethlisberger/Marshall for McNabb/V-Jax???

[kdavis]

In a 10 team Yahoo standard scoring league. We play 1QB, 2Wr, 2Rb, 2flex spots(wr/te/rb)
I've been offered Big Ben, Brandon Marshall, and Willie Parker for McNabb and VJax. Should I pull the trigger?
Thanks for your thoughts!

Here's my roster
QB- McNabb
RB- Steven Jackson, Grant, Moreno, L. Washington
WR- Fitz, VJax, Desean Jackson, Sims-Walker, Harvin, Maclin, Hakeem Nicks, Garcon
DEF- Packers
K- Tynes