Manhattan Pizza is a nice, fairly cheap option for New York style pizza in the Southwest Valley. Their prices are reasonable for the style of pizza they offer (i.e. not quick and dirty $5 takeout pizza from Little Caesar's or Hungry Howie's) and, as has been mentioned before, their customer service is great. Everyone that works here is very friendly.
Their wings are the best I've had at a pizza joint. They're nice and crispy and the sauce is pretty tasty.
They generally have good deals going most of the time, including lunch specials and an extra large pizza and 25 wings deal that's quite affordable.