That's how I did mine... wire transfer... I'm in Canada, too. (Winnipeg) I am typing this on my new MacBook that just came in today!
This is how it works: call the Apple Store, set up the pre-order. They will then email you the info you need for the wire transfer. (Make sure you get the address for Apple in Canada, as well as the actual Bank address... they will want that, too).
Then go to your bank and tell them you want to do an Electronic Fund Transfer. They will make you fill out a form, and generally discourage you from doing EFT... I guess its a pain in the butt for them... beware, making a mistake on this form can send your money to someone else, and they can say 'thank you very much' and keep it. So triple check the banking info...
I called Apple the next day, and they confirmed that they recieved they money and that the order was processing.
Good luck!