Kotobuki
Kotobuki, web site, 4822 MacArthur Blvd., Washington, DC, near U Street NW, on the second floor, 202-625-9080 (Metro Trip Planner - opens in new window) [Washingtonian | WaPo | MenuPages | City Paper | Don Rockwell | Yelp | Gayot]
The best sushi right now and remarkably cheap, the sushi is only a dollar a piece, yet the quality is very high. A real find. I've been waiting for a price shake-out in the sushi market, and perhaps the time for that has come. The also have Saturday lunch and Sunday dinner, they don't take reservations. A Beatles soundtrack plays all the time. Don't expect good service or comfortable seating, but right now this place is essential dining. The shumai and lobster sushi are especially good, in addition to the usual winners.