Which one of these three RBs do I start in Week 12 . . . Willis McGahee, Jonathan Stewart or Peyton Hillis?

I have a big game coming up in Week 12 of my Fantasy Football League. I'm fighting to get in the playoffs (I'm currently 9th of 12 and the top 8 teams are in). I'm up against the first place team (9-2 record) and it's a must win for me. I already know I'm starting Joseph Addai as one of my two RBs, but I need to make the right choice for my second starter. Do I go with Willis McGahee against the Eagles, Jonathan Stewart against the Falcons or Peyton Hillis against the Raiders? McGahee has had a couple 100+ yard games this season but overall he's been a big disappointment. He just can't stay healthy and he's up against a stout Philly defense. Stewart is coming off a 130 yard / 1 TD game against the lowly Lions, but he's still getting about 40% of the carries to DeAngelo Williams' 60%. Peyton Hillis is my sleeper. I picked him up this week because he had 70 yards rushing and receiving last week for the Broncos and he scored two touchdowns. But was it a fluke? He's actually projected to get more points this week than either McGahee or Stewart, but that's probably because he's up against the Raiders. I'm really torn and looking for some help.