Week 13 flex question: Cartwright, Britt or Chambers?

[Whisper]

12-team 1PPR league. I have three options at flex this week:

Chris Chambers vs. Denver
Rock Cartwright vs. NO
Kenny Britt @ Indy

I initially had Cartwright plugged in, as he's at least the current premier RB in Washington. But I changed that out to Chambers, seeing as how I anticipate KC falling behind early to Denver and having to air it out most of the day (and Chambers is their main weapon but doesn't draw too much double coverage). I expect Washington will go down early against the Saints as well, which may limit Cartwright's carries.

Kenny Britt is the odd man out...he's been Young's favorite target of late, but I don't know that Tennessee is going to score too many passing TD's against Indy's defense. Plus, I have Chris Johnson, and I hate playing two guys from the same team in the same week. Unless they're going against Detroit.

Thoughts?