For a kid from Queens that moves around a lot, finding "good" pizza can be tough. Florida was hard, California was IMPOSSIBLE, but in DC we got lucky.
The joint of choice for our family is "The Italian Store" 3123 Lee Highway Arlington, VA. (703) 528-6266. This is just across the river from DC... close enough to drive over during lunch, and I work in SE DC. It is in a Giant Foods strip center on Lee Hwy at Spout Run Pkwy. Easy access off 66, or the GW Pkwy to the Spout Run exit to Lee Hwy.
Pretty creative name, huh? The subs are excellent (long lines at lunch) but this is where I buy my pizza on the drive home from work. They do Neapolitan and Sicilian. Plain is excellent... toppings aren't necessary to hide the taste of the pizza like at those chain stores. It is a good Italian grocery with wine, pasta, cheese, and other imported items. They even sell Vespas (Italian motor scooters) out front.