I'm more of a tier guy, and don't see alot of difference between Toomer and Driver. I'd probably give Driver the nod having Favre as his QB, and I think he'll get even more love from Brett this year. Toomer has produced good numbers, but the Giants offense doesn't really do it for me, so I usually grab another WR from the tier of guys I like.
Johnson is probably the most talented of the group, but I don't see anything different in Cinci this year. If he played with a guy like Favre, he'd blow away Driver and Toomer. Stuck with the Bengals he's a cut below both for fantasy purposes.
Given those options in a draft, I'd go Driver, and Johnson could easily be there a round or two later for added depth.
The meek ain't gonna inherit $#!%....'cuz I'll TAKE IT!