Another optioin for you if you're looking for a 6" is the new upcoming Kobo e-reader. It's coming out in May and you can buy it at Chapters, Indigo and Coles locations in Canada. It's coming to Borders in the summer.
It's got some neat features but IMO a few drawbacks. No AC charger which some may not need or want, and it's got a rubber/plastic 4 way directional pad. I personally worry about it ripping when using it so often to scroll or page turn. The unit looks pretty and is priced at an introductory $149 Canadian. It's something to check out. It even comes with 100 books too.
http://www.koboereader.com/