Welcome to Wetpixel! As you've seen by lurking here, it's a great place
I took a look at your website and was very impressed with your snowboard photography. You've got some great images there! Thanks for sharing them with us. I've been to Whistler before and your images helped me to see the place in an entirely new light!
It's clear to me that your enormous talent in topside photography will no doubt carry over to your underwater photography.
I can't answer your question directly, but I'm going to steer you to the following place, Reef Photo and Video:Reef Photo
A lot of folks on this board buy their uw photo gear from Reef Photo, including myself, and have been very pleased. I encourage you to contact Ryan Canon at Reef Photo. I'm not sure about the exchange rate at the moment, but if it's favorable enough for you to buy in the US, you won't be disappointed with both their sales and service.
Also, I'm sure some of the Canadians who post here will jump in with their recommendations.
Again, I warmly welcome you to wetpixel.