There are only two things to consider: 1) Buttons; 2) Front light; For me any buttons at all are priority 1, light - priority 2. I have Kindle 3 and occasional

There are only two things to consider: 1) Buttons; 2) Front light; For me any buttons at all are priority 1, light - priority 2. I have Kindle 3 and occasionally use paperwhite. About 90% of all time you will read not in the dark, so light is not an issue. Other 10% may be a deal breaker, but personally I just use a phone with Kindle app.