Ok time to get serious and de-@amazon-ify.
Any recommendations for Kindle Paperwhite alternatives?
(… that are not paper books. I know you were thinking it.)https://twitter.com/slpng_giants/status/984527031458238465 …
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The big question for me is, how well does it integrate with Calibre?
I only use Calibre to manage my Kobo. Works for me. Also, no SD slot on the current Kobo models. But then again, superpoints!
I have the Aura One. P good. Love the Pocket feature especially, mostly use it for articles. Great for outdoors/beachside reading (SE-Asia must-have!). 
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