When I was in grad school, I made pizza once or twice a week, making my own dough and sauce from scratch. I lived across the street from an Italian deli, so I had access to a lot of great toppings: fresh mozzarella, prosciutto, and homemade meatballs, especially. One time, they received a shipment of mozzarella di bufala—buffalo milk mozzarella—so I tried using that. It was a little too rich for the pizza, and it overpowered the other ingredients, so I prefer using the fresh cow's milk mozzarella. I use a pizza stone in my oven to make the crust slightly crispy on the outside, but still chewy on the inside.
My favorite pizza would have a crust slightly thicker than a thin crust (for a little more chewiness), tomato sauce, fresh cow's milk mozzarella, meatballs, green peppers, and onions (preferably onions that are slightly caramelized—if they're too caramelized, they burn when the pizza is baking). Prosciutto and spinach is a great combo, too.