We've seen Buuren, Corsten, Tiesto, Schultz, Dyke, Digweed & Sasha, Slim, Oakenfold, and Deep Dish.
A guy who impressed me in San Francisco was John Beaver, but he won't be on anyone's top 50 best DJ's that I can guarantee...but he was good.
DeadMau5 is Canadian and is ranked in the top 5 in the world!!!!
Regards,
Menelaos