At WR, I would definitely go with Nate Washington. I think Santana Moss is out of the question due to his lack of usage in Washington's offense at the moment. D. Moore is a viable option, but I believe N. Washington could receive more targets if San Diego focuses on C. Johnson.
At TE, I would go with Jared Cook. This one is definitely close, but I think J. Cook has significant breakout potential this season and that J. Locker will rely on him heavily. He should receive slightly more looks than C. Fleener, but I wouldn't blame you for starting the latter.
At your flex spot, I would definitely go with Michael Turner. He's probably going to have a "disappointing" season and he doesn't really fit into Atlanta's offense, but he's a first string running back and should still be utilized a solid amount. He is still a strong player and with his larger amount of touches will have the greatest potential for fantasy points.
Please help me with this trade if you have time: viewtopic.php?t=520260