Hello and welcome!
As of right now, there haven't been any dates (or rumored ones I think) when the Kindle will come to Canada. That being said, I have a 505 and I love it! Is there anything in particular that makes you want the Kindle more?
I know Canadians are getting their butt kicked on the exchange rates right now, but you can usually find 505s somewhere for $250 USD.
Whatever you decide, I think you'll be happy. You're like the perfect ebook device customer