Any recommendations for Vietnamse or Thai places with a nice environment in the close-in DC suburbs or the city? I'm taking a friend out for his birthday next week and am having trouble coming up with some fresh ideas. My favorites (Ruan Thai, Nam's) are too casual. I've been to Green Papaya in Bethesda and thought it was good. Raku -- while not Thai or Viet specificially -- is another favorite.
Any other suggestions?