Was at my library today and the librarian showed me a Kindle and Nook Simple touch. The Kindle wasn't charged but the librarian said the text was very similar to the Nook, which I was very impressed by. Then I read about how terrible Nooks were getting, and so I took a look at a Kobo Glo and on Amazon it got more one star than five star reviews.
http://www.amazon.com/Kobo-Glo-Eread...DateDescending
I'm not a big fan of Amazon but it seems like it's the winner by default. (Would much prefer something epub indigenous.)