You've really got a problem at WR. Muhammad has a 300 year old man throwing to him. Thrash will have a tough time against tough Washington corners. Stallworth faces a tough Green Bay D as a rookie. Not good. Coles had a tough week last week, but should rebound and have a good game this week. He faces a tough New England secondary though, and might have a tough time getting balls thrown his way. Dez White would have a great game if they would choose to throw it his way. God only knows if they will.
I would start Brown, Coles, and White. But that's just an educated guess. You're really in a tough spot.