I wouldn't do it. I actually think orton will be OK and the drop off at WR for you is huge. I think that highly of Ausitn. My guess is, others will say to grab Brees, but I would look at who you will be playing at WR. If you think you can swing a deal with a RB to get another good WR, then that could work.
12 Team League. We start 2 QBs and get .5 PPR, otherwise standard scoring QBs: Stafford, Fitzpatrick, Collins RBs: Charles, Mendenhall, Best, Starks, Carter, Karim WRs: D. Jackson, Marshall, S. Smith, Green, TE: Hernandez, Cook
it depends on your league scoring. but, i would do it, even without knowing your scoring. even if it's a TD only league, the qb is in the best position to get you a TD, and with brees, he'll basically guarantee you 2 TDs a week. with bush out, he'll likely be throwing even more, if that's possible. i agree that you'll be very weak at WR, but if you can trade mendenhall for a top WR, then it all pans out for you.