Looking for small and simple eReader with buttons

Hello,

im as the title says, I am looking for a small to medium sized eReader. It should has buttons for turning the pages, preferably at the side not at the bottom. It also should have a good ergonomic. Also, of couse, it should have backlighting.

I don't need any more functionality. No music, no games, no whatever, just for reading.

PRice doesn't matter that much, it should just make sense.