Just a few things to look at when looking at a eBook reader
e-ink vs LCD screen:
E-ink is much easier on the eyes and very much like real paper. It uses very little battery and can last several weeks to a month on a single charge. They can be read outside at the beach easily.
LCD are typically the higher end ebook readers, they are really just Android tablets under the hood. They can do far more than read books like surf, check Facebook etc. Graphics look good on them if you tend to read graphic novels or that type of thing. It is harder to read outdoors, especially in the sun like at the beach.
There are two major brands to look at in Canada:
Kobo are usually sold at Chapters. You would have to buy most books from Chapters
Kindle are usually sold via Amazon. You would have to buy most books from Amazon.ca
You can also however download ebooks from the library via Overdrive, or sideload royalty free books on both by plugging into a USB port on your PC for both devices.
You can use WIFI to buy books directly on both types of devices or plug in via USB and buy from their website. However you do not need wifi access just to read the books.
I would consider visiting a Chapters store first, not because it is Kobo but because they seem to be well trained in the technology. They will be able to tell you all the plusses and minuses of the basic, back lit, mini and color models. They really seem to know their stuff on the hardware.