I'm not sure what's been sold where, but here's a complete list of 7T variants:
A phone sold as the "international version" is almost always an HD1900--that is, the Chinese version. The HD1900 has both Chinese and international ROM's available, and I think which one it comes with is a matter of where you buy it--but even if you buy the Chinese version, you can download and flash an international version of the ROM through the settings menu.
Ideally, in Canada, you want the HD1905, but it's no longer sold anywhere, and you're going to have a hard time finding it--I had to buy a used one. That being said, both the HD1900 and the HD1903 (the European variant) will work in North America. The lack of certain bands, especially on the 1900, may affect your coverage in specific situations, but I personally used an "international" version of the 3T in the U.S. (that was before they had a U.S. version) with no problems.
Note that the HD1907, while probably also suitable for your purposes, comes network-locked, and you'll have no way to unlock it unless you first activate it on T-mobile or a T-mobile MVNO--so avoid that one.