If you want to eat on Capitol Hill, on the House side, La Lomita Dos is good for Mexican and Young Chow for Chinese. Blocks from the House side is Eastern Market. The blueberry pancakes and other food in Eastern market is great. Around that area, Belga is great for brunch and Matchbox (pizza and sliders). These places should be within your minimal budget, but there are other options on 8th Street too.