Agree with the previous recommendations for Marcels and 1789. I've been dining at 1789 for over 10 years and haven't seen a decline in service or quality. I do agree that Kinkead's is not what it used to be.
Haven't done Maestro's yet, but all reports are good.
If you're looking for international fare, the Bombay Club for Indian and the Taberna Del Albardero for Spanish are good choices, with Bombay Club being the better of the two.
If you want to do a DC steakhouse, I'd recommend the Caucus Room.
Had a very nice dinner at Equinox this weekend, will definitely go back. My bison filet mignon was a delight, the duck my wife ordered was even better.
Cheers,
Jeff