Fantasy Football Trade?

I wouldn't do this. Orton is having a great year and should continue to do so as long as he stays healthy. The Broncos have no real running game and will be playing from behind often. Orton has the receivers to succeed and a year in the offense. Given that giving up Mendenhall to get Bradshaw is too much of a drop off given the other RBs you have. Mendenhall has done very well behind a poor offensive line despite the QB issues there. He should be even better when Roethlisberger is available.