Lots of good discussion here:
http://forum.calgarypuck.com/showthread.php?t=86367
I live in the US and went with the Barnes and Noble nook. I found it to be easier to use and more tech-forward than the kindle. If the kindle lost the hard buttons, it would be a huge improvement. You can access the Barnes and Noble site from Canada through Wifi and B&N sells "nook Lite" that doesn't include 3G access. Unfortunately, for Canadian purchasers, there are a few more speed bumps to get over to use the nook.
All that said, if you are looking for ONLY a e-reader, the nook or Kindle are good options and it comes down to personal preference.