Alexandria, VA area suggestions needed

[honeychile]

I'm chairing a convention to be held there this summer, and am looking for some restaurant ideas. One in particular would be for the last people to leave, on a Sunday night, for about 15-20 people, reasonably priced. I was thinking about the Silver Diner (mostly because of the atmosphere), but am open for suggestions.

If there's any other place that you feel is really special for the rest of the week, I'd love to hear them. I always end up going to the same places each time I'm there, and I'd love to hear other peoples' favorites! If it makes a difference, the convention is very loosely bound - the only thing that everyone does together are the Hospitality Rooms!