I actually just picked up Betts and Jamal Charles.  Kansas keeps stinking up the place, so there is a chance that Charles might not get a lot of action playing from behind.  I have never been a big fan of Fargas.  He's had plenty of time to shine and he always disappoints, so especially with McFadden coming back, I'd shy away from him.  Betts could be a good sleeper RB, but he hasn't proved anything so it's a big if, and Cadillac Williams has played well but is kind of a funk lately.  I would take a gamble on Betts since he could have high carries and opportunities for big plays.  Williams I think would be a more sure thing pick.