Which WR do I sit in week 7?

I have Santana Moss, Terrell Owens, Wes Welker, and Anquan Boldin. Anquan Boldin is a no brainer. Terrell Owens is probably going to be my number 2 WR. So should I sit Santana Moss or Wes Welker. I don't know how much Brady will throw to Welker with Branch as an option now.