I'm amazed you've managed to read on a PRS600 this long. I kept mine a couple of weeks and ended up donating to my public library because I found it nearly unreadable.
Whatever you get, you're going to LOVE IT SO MUCH after years of reading on a PRS600.
Since you prefer buttons, looks like your best choices are the Kindle Voyage or Oasis, or the Kobo Forma.
There are some Android e-ink tablets that also have buttons that you might want to look into.
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