I happened to wander into Gelato de Roma in Pasadena and was wonderfully impressed with the pizza, which I believe to be the best in Pasadena.
The place will fool you as it looks like it serves gelato only. But the pizza is very good. It is a thin crust, with great sauce and good quality toppings. The pizza is priced very reasonably.
It's located on the south side of Colorado between Arroyo Parkway and Raymond.