I've not had any stand out potstickers in the DC metro area. Most have overly thick wrappers. For a while, 100 Degrees Chinese made them to order and they were probably the best but I don't know if they do that anymore. In any case, it wasn't anything special.
The dumplings at China Bistro in Rockville are excellent. this is THE place to go for dumplings. But I have only had them steamed, not fried. I have never asked for fried, so I don't even know if they do that, but I suppose it is an option.