Not sure where in GTA you are, but there appears to be a good shop in Mississauga, near the 427 and QEW. Might want to stop in there to chat with them. Chris Van apparently is the person to ask for.
http://www.skiisandbiikes.com/services/ (scroll down about 2/3 where they talk about boot fitting)
http://gifts.skiisandbiikes.com/bootfitting