Please remember that Québec is Ticketmaster free (yay for us!), therefore all tickets for Montreal will be sold via Admission (admission.com, 514-790-1245). I'm not sure how the pre-sale will work out.
Also, I'm a bit worried about the Admission site crashing, that's usually what happens when there is a big show going on sale. I don't think they have this virtual line system that Ticketmaster has, unfortunately.