I would use it on Miles Austin. I think this guy has to get a lot more opportunities after the show he put on and it's not like the #1 WR position in Dallas is not up for grabs with Roy Williams failing to live up to expectations and Crayton proving over the years to not be a WR1 calaber player.
Well neither of those WR will be useful this week, since both teams are on bye. With that said, if you do take a WR, I would look to make a trade. You are obviously doing well at WR and could use some RB help. What team in your league needs help at WR the most and has a RB that you would be interested in?
I watched the entire Dallas game Sunday and Miles Austin will be a starter from here on out or heads will roll. He's a beast, physically imposing and much faster than Williams or Crayton. Think A.J. Jr.