Making pizza

So I have been trying to make pizza lately. I've made it about four times so far. The first time was a total disaster. Although the BF wanted me to give up, I keep trying again and again and yesterday I think I had my first real success. The sauce was good, the crust was cooked and crisp but not burnt, and the vegetables were good. It looked so good coming out of the oven, I should have taken a picture.

Now I want to buy a pizza stone to see if that makes it any better. Anyone have any experience with these things? Do they really work? What brand is good?