Well lets break it down. For one Steven jackson is not even part of the trade so to speak. He is out until at least week 10 & if he does play by then, he may not be the same this week.
Adrian peterson is simply one of the best RB's 7 he has proved it every week.
Cleo Lemon in there, Chambers has gotten some passes in but has not gotten a TD.He is still a #1 reciever. Portis is a good RB but nothing compared to peterson. Henry will probally be gone in a few weeks. You may use him until the legal procedures take place. Read about Henry first.
If you got a sucky team & you need players. You may have to take the trade. Otherwise if you got a great solid team already. keep peterson.