to save you from all the hassle just apply for WHP
http://www.whpcanada.org.au/introduction.shtmlvalid for 24 months. Processing is fast, 10days from sydney office.
you can extend the same as per new rules. until last year it wasn't extendable.
since you would be staying more than 90 days(in north america), if you come via Honolulu,USA you would need a transit visa(a hundred buck or something). If you want to make things even more easier avoid going to states, fly via taiwan or japan and straight into vancouver. That way you could spend that money on Tim Hortons instead. USA is pain in the rear all the time.