MJD for damn sure. Faulk is mostly a 3rd down change of pace back. The Chicago D is tough, but hasn't played well the last couple of games. Unfortunately, they are my only D in 2 leagues that I am in the playoffs in.
BTW, in one of my leagues, I am starting Hightower and Forte ahead of MJD, Portis and Barber. Injuries, matchups and yeah, gut feelings play into it.