http://www.dc495.com/wiki/index.php?title=Eat_in_DC
First, skip anything in DC.
Might be within 20 min driving if you hit good trafic.
粤:
汉宫 (VA), 新世界 (MD), 怡东楼 (MD)
川:
八方食府(VA),百川味 (VA)
台:
半亩园 (A&J) (台式北方面食 VA one is much better than MD one)
台菜66 (MD, my favorite).
老皇历了,Check yelp for review.