I stayed for $71 on a Friday night to bump me up to plat. Nice hotel after the renovations - I even got the 1000 pt renovation bonus for that promo. Not much in walking distance but fine if you have a car. Didn't get club access.
Edit: nvm. I stayed at the Sheraton Tysons Corner. Reston does have a bunch of shops and restaurants about a 10-15 minute walk away.