I need help on my fantasy team situation?

my fantasy league rosters are frozen at kickoff for the lions tomorrow. I have Ahmad Bradshaw, Reggie Bush,Rashard Mendenhall, and Clinton Portis. They stink. Which ones should i drop, However, there are no good backs available for free agency. So I am completely open to a trade. I really want to dump a wide Receiver, I have Andre Johnson, Greg Jennings, Sydney Rice, and Miles Austin. I want to trade, but everyone in the league has said no, except 1 person. He has great backs, Steven Jackson, Cedric Benson, Leshawn McCoy, and Laurence Maroney. I really need backs, because i am fighting to make the playoffs (three way tie for 3rd). The best back for Free Agency is Julius Jones. If i make a good move, i will likely make the playoffs, because my lineup will be great. QB-Peyton Manning RB-? RB-Rashard Mendenhall WR-Andre Johnson Wr-Sydney Rice TE-Kellen Winslow K-Steven Gostkowski DEF-New Orleans