Tiki Barber actually went undrafted in my money league, so he would be the best pickup overall. He was gone after week 1 though. In most leagues though I would suspect Stokley would be near the top of that list.
some other top candidates would be
Driver, Pittman, Blaylock, Brees, Muhommed, Bettis... I dont count Jones because he was drafted in almost all leagues.