Depends on the scoring... I would say McGahee is a no brainer, but if you get good scoring (bonuses etc.) from RB yards receiving then go after Edge. I kind of think your options are going to be taken away and you'll have to go Willis which is probably the smart pick anyhow.
No way do I go Priest there. Maybe at #9 or 10 but not at 5. LJ is playing lights out football and after last year he'll get his share of carries. It won't be RBBC but I wouldn't be the least bit suprised to see LJ with 125 carries or more. There's also the injury concern with Priest!