Thanks fellow chowhounders for the recommendations. We had two great meals, first at Johnny's on the Half Shell, then at Al Tirumiso. We called for reservations for both, since the restaurants were small and we were a large group, but both were very accommodating, and the food really good. Had great bouillabase (sp) at Johnny's and really liked the fried oysters and grilled calamari. Surprisingly, desserts were a dissapointment: we actually ended up ordering everything on the dessert menu (though I did like the lemon chess pie a lot).
Al Tirumiso was great: they sat us in the way back next to the fire place, we had all manner of grilled fish, pasta, calamari and it was perfect.
Thanks everyone. We look forward to our next DC trip.