I may be in the minority, but I don't see the Giants D as a good option at all. Most of the time, when a crappy defense plays a crappy offense, it tends to benefit the offense. Add in a divisional game, and I'm not sure the Redskins don't have a decent game. I'd go Detroit, they are a better D than the Giants, and have a more uncommon matchup.
I think Woods is the clear call at flex. He's been extremely consistent, and the Bears will give up a lot of yards Sunday Night, probably over 400. Woods has a 75 yard floor in my eyes, can't say I feel that confident about Boyd, Edelman, or Mack.