I wanted to see if the trade was fair staright up before looking at the situation. I would be getting Schaub and Jones. It is also a 2 QB league and a Dynasty league.
I honestly wouldn't do this trade. Manning is playing great right now and while Schaub will be limited cause the Texans like to run alot. And J. Jones isn't playing elite this year, he has been very inconsistent courtesy of the high powered offense. Any given day it can be Jones, or White, or Gonzalez.
Though I'm not sure how dynasty works. If you can keep your players every year, than I would think about it b/c Jones will get better every year and Manning only has a couple of years left, if that...