Is there someone else you can drop instead of Berrian? I wouldn't be so quick to count him out. No doubt the fantasy potential in D.Jackson and Crayton are worth grabbing if you can, but once Farve and BB hook up I expect we'll start to see fireworks again.
If there isn't someone else you can afford to let go of, I'd target Crayton over Jackson mainly because of the QB strength in Romo vs. McNabb's backup...at least for the upcoming weeks.