I must confess, I have a fierce addiction to Red Fork Natural's Chicken & Smoked Gouda pizza. I buy it at The Fresh Market, so I can't promise it's sold at your local grocer, but let me just say, it is hands-down the best frozen pizza I've ever had.
The crust is flavorful, the sauce is thin but not absent, the gouda is SO WONDERFUL and the chicken isn't nearly as scary as most frozen pizza chicken can be. I have taken to eating this almost every time Sean has to work. (He hates gouda.)
Omigosh, just thinking about it has me salivating. Real Simple named their margherita pizza the best frozen pizza, and they also make a bianca pizza. I think one pizza costs between $5 and $7 depending on whether there is a sale going on. Seriously, if you can find it, try it!