My advice: Get a cheap basic ereader. Turn off all the features you can(airplane mode works). Use Calibre. Every 2-4 weeks charge it and put books in it (not too many!). Forget about upcoming models. It's a book. You wouldn't care if a new edition of a novel came out with a different cover and font.

Mine is just for reading books (not articles, reports, emails, blogs, etc). When I pick it up, I relax. I read books. Completely different to the ADD experience of picking up my ipad. Strangely, I went back to reading fiction after buying it.