Fantasy football advice

[Zack]

So I'm looking for some fantasy football advice.. this year I drafted quite a few qb's to make up for getting a bad draft order thinking I would trade them away as the season progresses. My first QB was Vick (bad choice), second pick was RG3, then Big ben, then Peyton Manning in the fifth round. I traded Big ben for Willis Mcghee and Chris Johnson (Tenn) and now I'm being offered this trade:

Trade Away:
RGIII or Peyton Manning
Viking D/ST

for
Ray Rice
Texans D/ST

Here's my roster:

With MJD out for undefined time and Brian heartline at flex not doing well in his last few games I feel this could be a good pickup. Also, it will allow me to switch out flex players depending on matches. I feel like while RGIII is having a decent season, when push comes to shove I feel as if Peyton is proven and his schedule is pretty easy from here on out.

So, my question is, is either trade good? If so, which would benefit me better, dropping RGIII or Manning?