Canada's top three business schools are in and around Toronto
Ivey, a great school for entrepreneurship and global business, is located in London (a few hours outside of the GTA) and is a one-year program.
Rotman, the leader for finance and health care administration, is right in the heart of downtown Toronto (note, this school is one of the most expensive in North America, especially for int'l students).
Schulich is Canada's premier marketing school and offers a number of nifty streams no one else does in Canada (Non-Profit Management, Arts & Media, etc.) and is about 25 minutes away from downtown Toronto.
I've done ENDLESS research on these three and would be happy to give you as much info as you want! Fire away!