Washingtonian Magazine has a great article this month listing 75 Great Bars in the DC area. Clarendon and Ballston are pretty well represented in their list, including nine local venues listed under several categories. I would argue they missed a few spots, including Hunan Number One (should be listed in Dirt Cheap Drinks) and Iota (I would put in the Music and Dancing category).
Dirt Cheap Drinks
Good For Games
Cozy and Casual
Beer Heaven
Music and Dancing