Tachibana
Tachibana, web site, 6715 Lowell Avenue, McLean, VA, 703-847-1771, there is also a branch in Bethesda (Metro Trip Planner - opens in new window) [Washingtonian | WaPo | City Paper | food-plan | openlist | Yelp | Gayot]
The best Japanese place in the suburbs. Not at all cheap, but the quality justifies the prices. Many entrees are in the $20 range.