Granted, I haven't tried ALL the pizza in Arlington, but Gemelli is my favorite right now. Their thin crusts are great. My favorite is their specialty pizza, Gorgonzola (contains carmelized onions, wild mushrooms, and gorgonzola cheese!). When in a simpler mood, their Margarita is wonderful too. Of course, you can create your own pizza too.
My only complaint is that there is not much room to eat-in, but I prefer to take-out anyway.
more