Peperroni and mushroom is my all time favorite. I also like Hawaian, it must be Canadian Bacon, pinapple, onions and jalapenos. Its just not the same with out the jalapenos.
I'm very traditional when it comes to my pizza, so no unusual stuff for me. Meat only (pepperoni, canadian bacon, sausage, etc.) and some green pepper. That's it. Oh and extra cheese of course!