While I may not be a sushi expert, I've tried a couple of different places in Montreal and to me, Yuki Sushi Bar has the best ones. I love the spicy mayo they use and the fish is always fresh. The thing is, you HAVE to go there for take out. You may wait a good 20 minutes for your order but you can see them make your sushis so you KNOW they are freshly made(not like some other places that tastes as though it was sitting in the fridge for a couple of hours...). Plus...You never have to ask for extra soy sauce, ginger or wasabi (they charge you a whopping 1$ for each extra you order) because they give you at least 15 of each with your order!!
You should have a full stomach with 20$ for 2 people.