welcome to the forum, indeed you will find quite a few Canadians here.
Denise (name on the forum "Denisex2boys) had surgery in London Ontario with Dr. Parnas, who is considered an expert in the field.
Of course there are many experts in Toronto, with Sunnybrook and Toronto Western being the hubs. Dr. Rutka (I think at Toronto General) is the top neurotologist in the field, and there are many other neurosurgeons at Sunnybrook and Toronto Western.
As far as radiation goes, the closest one to you would be the Gamma Knife centre at Toronto Western. A CK facility is planned for Hamilton, but I am not sure about the time frame.
There are many forumites in the Toronto area, Ann ("Keeping up"), Nikki ("Opp"), Vivian have done extensive research on the various doctors and you may want to get their opinions.