Mark's Duck House in Falls Church is a very popular weekend destination for dim sum with their rolling carts of nibbles. They also have an extensive menu of over 400 dishes. It's Hong Kong-style with a growing Vietnamese clientele. Specials and the menu are written in Chinese, Vietnamese and English and the restaurant has been around over 25 years. With a large number of round tables, it's good for groups and families. http://www.marksduckhouse.com/mainmenu.htm
Salt-baked prawns with chili, head and shell ($15.95)
A bit cumbersome to eat, it was one of the recommended dishes from reviews I read.
Diced chicken with cashew nuts ($10.95)
Sliced chicken with asparagus ($11.50). The asparagus were delicious.
Half Duck ($16.95) with scallions and pancakes.
It's not sliced tableside like at Peking Gourmet Inn, but with a name including "duck" you have to try it.
Seafood Lo Mein ($13.95)