As an Arlingtonian who works in Gallery Place, but hasn't done a lot of the Logans Circle/ U street places yet: Brasserie Beck has awesome mussels and beer, pretty tough to beat for HH. China express used to be my favorite cheap eat in chinatown, but Mings recently opened up a block away, and IMO, blows it away for everything that isnt noodles (china express noodles are orgasm-inducing). If you like BBQ, cap Q is the best I've had around here, not mindblowing, but always pretty solid. That said, getting a smoked turkey from them for thanksgiving is among the best $75 you will ever spend on food, period. Havent tried hill country yet, theyre a few blocks further from my office and looks ~50% more expensive than cap Q, but they do have sausage shipped in from Kreuz's in Texas, so it might be worth a trip for that. EatBar in Clarendon is awesome for the price, their chicken and waffles is something you have to try. Small, but good beer list. Another vote for Pho 75 and Rays Hellburger as well. Hardly a definitive list, but these places are my normal lunch/dinner haunts.