For your references, all the Canadian Tire, Costco, Walmart's tires are OEM.
On other hand, most car dealers and tire stores sale the original.
For the best quality/price ratio, Kumho Touring A/S 795 may be one of the top choice (http://www.tirerack.com/tires/tires.jsp?tireMake=Kumho&tireModel=Touring+A/S+795).
OK Tires (chain store) is one of the Kumho's official dealer and at least one of them is in east Ottawa as I checked the phone book recently.
Hope it will help a little.
Michelin has the best reputation in North America, but it is more expansive. Since tires are so important to your safety, if you can afford, I suggest you select Michelin.