i'm visiting dc this weekend and wanted some restaurant ideas. i'll be staying in ashburn, but i think we're going to dc for most of saturday and part of sunday. looking for maybe one nice (not too expensive though) dinner suggestion and fun places for breakfast/lunch (diners, holes-in-the-wall, etc.). i don't have any specific cuisine in mind. is there anything dc is known for? i'm always up for trying something new. any suggestions? also any suggestions on sites/places to visit while i'm there? thanks!