Chain Pizza: Dominos, because the individual stores for Papa John's and Pizza Hut in our area suck huge donkey balls (pizza hut likes to send us raw pizza and papa's is cold every time, even if they get here within 30 minutes of the order).
"Local:" Pizza Pipeline or Pizza Perfection. These were the pizza places of choice at WSU, where I went to school. They're cheap, flat, extremely cheesy, and delicious. Plus, Pizza Perfection used to have a buy 1 get 1 free carryout deal, so everyone went for that.
Frozen: Red Baron if I actually want to taste the pizza, Totino's Party Pizza if I just want something cheap and fast.
Homemade: I have a deepdish recipe that is always made with sausage, pepperoni, fresh mushrooms, red onions, and black olives. Also, my parents and I have been making the mini pizzas out of Wolfgang Puck's cookbook for years. They really like his smoked salmon pizza (I hate fish), and I love the idea of putting caramelized onions with pepperoni - is very tasty.
Personal creations: These two are really, really bad for you, and really, really tasty - even if they are made from crap ingredients.
1) Sausage pizza sandwich. Acquire 1lb of bulk ground sausage (I use Jimmy Dean's Hot or Bold sausage), and two of the aforementioned Totino's Party Pizzas, preferably peperoni. Brown and crumble the sausage, bake the pizzas, and use the pizzas as bread for the sausage.
2) "Biscuits" and sausage gravy. I recently bought 4 party pizzas and 2 lbs of sausage, but we ate one of the pizzas by itself so I didn't have enough for the sausage pizza sandwich. I did have sausage gravy makings though, so substitute party pizza for biscuit and add sausage gravy.