If you're in Montreal and looking for pizza, get your butt over to Amelio's. If you can, try to go on a weeknight, or early in the evening, because this place is small and fills up fast. The line runs down the street even in the sub-zero winter weather. Take-out is a good option if you live nearby or have a car. Otherwise the walk will cool off your tasty pizza fast. Restaurant is BYOB.
Beware that the owner (manager?) tends to yell at his staff. It can get a little awkward.