I was reminded of one of the delicious meals we had in Thailand when I visited Thai X-ing over the weekend. (Thanks for the recommendation Johnna!) We went to a similar place in Chiang Mai, called Huen Phen. Like Thai X-ing, Huen Phen is a bit dark and dusty. Thai X-ing is the first place in DC that I visited that actually tasted authentic. The prices are a lot higher than Thailand, but it is worth it ($40 for 8 courses and BYOB).