I have a Kobo that you can get at Chapters or Indigo here in Canada. There is quite a large selection of free e-books (mostly classics) available on the Chapters/Indigo website. To purchase e-books, you can either use your credit card on the website, or if a nice person gives you a Chapters/Indigo gift card, you can apply your purchase against the value of the gift card.
It has a slot for a microchip so you can store your PDFs on it for your e-reading pleasure. I use that feature for my reams of downloaded PDF knitting patterns - it's quite handy in that regard.
The battery charge lasts quite a while, and only takes a couple of hours to restore to 100% power. I also like that I can use the Kobo app on my iPhone if I don't want to cart the e-reader around. The app syncs the devices for you so that you can always pick up where you left off.