I’ve got a Meebook M6 that I’m very happy with. Its basically an e-Ink Android tablet with and SD slot and Google Play, so you can load the Kindle app or whatever you want if you’ve got that stuff. Most importantly, I use the Moon+ Reader app and load .epub/.cbz/etc formats plus it does an awesome job of reformatting .txt/.pdf/.lit. Bonus for me: Moon+ also supports custom fonts, so I can use Dyslexie.
Bluetooth works great. Debian w/ XFCE (pulseaudio). But, there is some config on a fresh install: