I like Mia Za's, even though it's not exactly my first stop in Campustown. Lines tend to be long, and the meal I normally order is a bit steep for lunch. But it's good food and cheap Italian if you need a fix.
I'm fond of the thin-crust pizza, and I normally get half with a spinach salad. But the menu is so diverse as to be overwhelming. Come prepared to fill out a scantron of deliciousness; it's totally worth it every once in a while, but the vast array of options slow the place down to no end.