Draft and Trade Talk Message Board
I'd go in this order:
1) Adrian Peterson
2) Arian Foster
3) Chris Johnson
After that just take the best player available.
Generally it is rule of thumb to take a RB first, since they are scarce. However, if you are in a 2-qb league, or have heavy qb scoring, consider taking Vick/Rodgers type QB with your first round pick.
Hope I could help. Good luck!