CB for this week

I picked up Captain Munnerlyn, but after looking at the sleepers for the week, I'm wondering if I should pick up Arrington or Talib instead?  
For that matter, I have Jennings...do you think I should drop him and the captain and pick up arrington and talib?

Thanks!

Arrington has a really good matchup against a pass-heavy Cowboys team. Romo has been throwing up a ton of picks lately. I like his chances of scoring a few points.

Dowling is listed as the CB on the Pats depth chart...as well as the start/sit post by Bill.
Arrington plays only partially, right?  Still a good bet for sunday?

Arrington is listed behind Devin McCourty at LCB, but i think he is there nickle back. So against a Dallas offense that will look to spread the defense out Arrington will see a bunch of field time. Like Ryan said, Dallas has been a turnover machine with Romo makeing bad decisions with the ball. Arrington should have some opportunities this week.

Thank you o wise ones!

I'm an arrington beleiver this week!