Pizza Na Roma on Locke Street, Hamilton is the best Pizza that I have ever tasted in Canada. I've had hundreds and hundreds of types of pizza in North America and Europe.
This place is a MUST if you live in Hamilton. There are pictures and other info on their Facebook page. I'm not sure if they have a website yet.
This is a Roman style pizza-by-the-slice place. They use a 72-hour dough process and the owner was trained in Italy on the art of making this style of pizza.