Diner culture in DC sucks, but there's an oasis for quality cheap breakfast at the Kozy Korner Restaurant at 20th and N (approx.) diagonal from Firefly restaurant. Nothing flashy, plates that obviously have been used a lot, 2 eggs overeasy, hashbrowns, bacon or sausage, toast all at a cheap price. their coffee is a bit weak, so load it up with the half and half and the sugar. Breakfast for 3 of us ran about $20.