http://www.montrealpoutine.com/reviews.html
I went by these reviews to pick my place. I ated the small T-rex and the Trios Amigoes and felt like dying from a heart attack after. Note: Normal people eat one plate... or half of one small plate. Also remember that sausages are HOT DOGS.. I was rather annoyed by that.
For schwartz, just do take out and eat on the street. Saves the annoying line-up and the food is just as good.
When are you going? I might be hopping on the train to visit around Christmas.
Completely random, but come to Toronto and eat at Rain. I had a meal there last weekend and it was fucking amazing.