I use a boox leaf 2, it has android without google play services OOTB, you can install that if you want and you can side load apps like normal android too. It has a nice crisp screen, adjustable backlight (color and intensity) micro SD slot in addition to the 32gb internal storage. It will open pretty much any eBook format out there, and you can also use kindle app and adobe digital editions for DRM books (if you don't strip the DRM)
I highly recommend it.