I know a little about doing business in Canada. Someone wrote that the US/Canadian border is the largest one-way mirror in the world (you see us but we don't see you). Canada is typically treated like a mini-US -- 11% of the population with similar tastes, culture, habits, etc. Most people use 10%, just 'cause the math is easier. Some say 10% is proper due to lower disposable income.
I have a number of Canadian clients who file in the US first because that's the first market they hope to expoit, after getting their feet under themselves in Canada. Afterall, it's a market ten times that of Canada, yet the patent application doesn't cost ten times that of a Canadian application -- but it's not quite the same cost either. But, comparatively, it's a bargain given the market size. Plus, given that the US has some of the most onerous requirements regarding disclosure in a patent application, it's often best to start here -- making sure that level of disclosure is met -- then file outside the US where the overkill of disclosure won't hurt you.
Somewhere, I saw a thread of discussion on reciprocity between the US and Canadian patent offices. I have enough Canadian clients (more an issue when things get international) that I periodically consider qualifying for practice in Canada. Every now and then, when I get frustrated with my government here, I start eyeing the real estate market in Victoria (very much like Seattle, I understand) and trying to figure out electronic USPTO filings using Linux. So practicing in Canada (or from Canada) could be an option. ;-)
In short, if -- like many Canadian businesses -- you hope to go after the US market first, then spread across the globe reaping in your billions, I'd file first in the US, then PCT at the one-year deadline (assuming things are looking good but you don't know where your product/service will be big). Be aware that you'll need local counsel for the PCT -- US counsel can't represent you unless you have at least one US resident/citizen applicant or inventor.
One last point: this is just an off-the-cuff opinion and an observation of what others do. I don't know your particular business, so I can't possibly say whether this is the best strategy for you. Everything is cost/benefit analysis -- and that's a business decision, not a legal one. I may have suggested one possible course of action, but that doesn't absolve you from doing your homework to make sure it's the best thing for you and your business. That's probably understood, but it needs to be said once in a while.
I hope that helps.
Regards.