Given your requirements, I'd take a serious look at the
Kobo Touch 2.0. The cost is below $100, and if you order from Chapters (which is the link I gave above) you can take advantage of our painfully low Canadian Dollar. (Currently trading at $0.69 US).
Another option would be the
Kobo Glo HD. If ordered from Chapters it would come to about $90 US. It has a much better screen then the Touch 2.0, and has the best-in-class Kobo frontlight system.