I love Wheaton, I've only lived here for 2 years and before that grew up in DC. At any rate, there are a large number of ethnic restaurants, some good, some bad.
Hollywood East is a must for dim sum, though it does get crowded if you get there after 11:00 am.
Moby Dick - not to be mistaken for the middle eastern place in Georgetown, its a sushi place run by Koreans, but its actually pretty good.
Hard to go wrong with the Pho places around here.
Ruan Thai - apparently a best kept secret in at my place of work. Its affordable, the service is decent, and the food is pretty good to.