The only Arduino vendor in Canada I know of (Fundamental Logic, in the Toronto area) has closed down. Which is too bad, because I really like the design of their MaxSerial board. That doesn't mean there is none, though, because I don't keep up on Canadian suppliers.
If money isn't super tight, you probably want to go with the Uno, because it has the extra USB capabilities.
If you're pinching pennies, I recommend a kit from NKC. Or an RBBB. The RBBB is especially nice for building Arduino functionality into your own designs, or for adding a small number or parts to it on a solderless breadboard.