My current top eight in the DC area*, limited to those courses I've played, is:
1. RTJ (VA) [It gets better each time I play it -- flame away!]
2. Congressional Blue (MD)
3. Columbia (MD)
4. Four Streams [Used to have this higher, but I played it recently for the 4th time and was underwhelmed]
5. Congressional Gold (MD)
6. Bethesda (MD) [Maybe I'm a homer, but I think it's solid.]
7. Chevy Chase (MD)
8. Westfields (VA)
*I'm thus not including Baltimore, Beach, or Southern VA courses.