Yeah, our dollar is extreeemely low right now compared to what it could be, so it wouldn't be a bad idea. Just make sure that you're accounting for the exact exchange rate (use a currency converter). Figure out what the final cost in USD would be, including taxes, and do the same with the Canadian model, then compare the costs.
Like Dave said, taxes in Ontario (HST - Hardmonized Sales Tax) is a whopping 13%