I feel like not enough people have given feta a try. Maybe because it's usually a premium topping and you have to pay a little extra for it, or maybe because it just looks gross. I usually only get it when I'm stealing food from work. But damn does grilled chicken, feta, tomato, and onion make a tasty pie.
Onions never seem to get as much love as they deserve. They fry up in the pizza grease and get sweet, they pair really well with any sort of meat topping like pepperoni or sausage.