I'm looking, too, OP. And since we have kids, I know they'd prefer a buffet so they can pick 'n' choose what they eat. Any buffets folks can recommend?

There is a piece in today's Washington Post Weekend section about this - I can't find it online but it is in the print edition, anyway.

We will be just three adults and one child (6) this year for Thanksgiving. No one really feels like cooking (and of the group, I'm the only one with any cooking skills and I really don't want to cook), and we would like to go to out to eat. I have been to M&S Grill in other years and it's okay, but we'd love to try something different, or maybe even a bit more fun because of the six-year-old. Northern Virginia preferred, but DC okay.