If you're in Old Town Scottsdale I highly suggest Joe's. It is perfect for a lunch run with their lunch special or an amazing late night snack.
I worked at an office building across the street and ate here quite a bit (more than I probably should have). Most of the times it was for their lunch special which is buy two slices and get a third free, I believe its normally around $6 which is a good deal especially in Old Town.
In terms of their actual pizza, I am a big fan of the bbq chicken.. I would dare to say that it's one of the best bbq pizzas out there! Of course, they have great selection and all but one of the pizzas are sure to amaze (sorry, but I'm not a fan of the buffalo).
None the less, Joe's is simply amazing and Joe is a pretty good guy himself (he's in everyday at lunch). In fact when I told him it was my last time at Joe's due to a move he thanked me for "being part of the family" and gave me pizza on the house (told you I went there a lot lol)!