Libra2 is a Kobo model. Not the cheapest, but very nice and it has page turn buttons. It also has Blutooth for Audio book playback (AFAIK no file transfer)
All Kobo's can be side loaded. No Walled Garden, but still has a store if you want to go that way.
My personal pref is to avoid Kindle's because of the effort they appear to make to discourage Side loading (and calibre access to managed collections)
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