I love St-Viateur. The bagels are the best in MTL, coffee is free with breaky, and the portions are large. It's not that expensive compared to most brunch places and you won't leave feeling ripped off.
I love the smile breakfast, served with an all-dressed bagel. I'm always stuffed after finishing it.
The staff are very friendly and always love to share a laugh with my little boy =P
You can also pick up some bagels around the counter area and get it to go with some cream cheese. Makes for a lovely breakfast at home.