I had a similar dilemma when it comes to e-reader, my ideal device would have a 6-inch pocket sized backlit screen and run Linux. 7-inch Kobo was the best alternative I could find from this decade it&rsquo;s served me well so far. 
 
There&rsquo;s a great choice of free ebooks knocking about and Calibre was finally posted to Python 3, happy days.