This may not be quite a chowhound question, although it involves good alcohol, so it may be close.
Two of my friends and I (all twenty-somethings) are looking to rent out a room in a bar in August in D.C. to celebrate our respective birthdays. I'm looking for someplace that is a moderate-to-classy bar and, being a snob, someplace that has *good* beer on tap (if I were back in Baltimore, someplace like the downstairs bar at Brewer's Art). Does anyone have any suggestions? We'd probably be hosting 40-50 people.