Romantic restaurants in DC??
Palena (back room) - Cleveland Park stroll
Taberna del Alabardero - not so much to stroll around there
Obelisk (for casual romance) - Dupont Circle stroll
As fr poster's above suggestion, I like Butterfield 9, but I don't love it, nor do I think it is a necessarily romantic restaurant. The stroll after is a nice idea, though.
I love Dino (upstairs) not certain quite how romantic that is.
For inexpensive, I think Miss Saigon in Georgetown is pretty romantic, actually.
I agree with Palena. Also you might want to try Butterfield 9...then you can stroll around near the White House which is always nice.
I think Bistro D'Oc is quite romantic but there isn't much around the restaurant to stroll to.
Equniox is on the higher end but quite romantic with wonderful food...you can walk towards Dupont Circle afterwards.
Also in Dupont is Al Tiramisu and the French restaurant next door (who's name I can't remember...I've never eaten there but the place looks romantic)