vavroom: For those of you who don't remember me, I was raised in Quebec and lived through about a LOT of winters before leaving North America to go live in NZ for a dozen years. I've now been back in Quebec for a couple years.
The advice elpie gave is spot on. I can only reiterate: Layers will keep you warm. Natural fibers for under layers (wool is best), and a good waterproof/windproof outer layer. And a good pair of snow boots if you're going to face that.
I don't really do big down coats or jackets, even when it's -40C.
As for Canada GooseGeektastic: I was in Queenstown last week and saw some Canada Goose stuff. Very expensive indeed. It's never cheap because it is very good, but pretty sure it would be cheaper in Canada.
Canada Goose USED to be very good. Now they are average. They are still trading on their name. They were never designed for urban activities. Now, they have models designed for that, but their entire range has gone down hill. It's a veritable fashion to wear Canada Goose (incidentally, it's a HUGE fashion also to wear Ugg boots outdoors in winter here).
But as many have pointed out, it depends on where in Canada you are coming (it takes 5 days to drive from one end of the country to the other, so it's not like the weather will be the same...) and it depends how long you'll be here.
That is a shame to hear; mine is one of the ones made for the antarctic expedition folks and in Whistler, I wore it comfortably at -15 with a t shirt underneath when going out in the evening apres ski.