If you are in Washington, DC we have a great place for gluten-free pizza - Ella's. It is across the street from the Portrait Gallery and the Spy Museum. Reasonable and excellent. I have been told that Pete's New Haven also has a gluten-free pizza, but I have not tried it.
I make pizza at home all the time. I have tried a number of the frozen crusts. The best I have found is Kinnikinnick. They are not always available and I often end up with the Whole Foods brand which are good. I have made the Amy's and the Ener-G, but I usually end up eating only a little of the crust as it gets too heavy.
I will have to look for the Udi's. We have only recently started getting the Udi's products here. I have gotten the bread, but haven't seen the pizza crusts.
"A journey of a thousand miles begins with a single step." The Way of Lao-tzu Chinese philosopher (604 BC - 531 BC)