Hi Olga,
I had more or less the same requirements as you (besides wanting to read books as well). And I concluded Kindle DX offered me a reasonable compromise, PDF features and all the rest.
It's far from perfect (no annotations on PDF being the biggest lack), but I'm very happy with it and - reading 15+ PDF scientific articles per week - I must say worthwhile.
But yes, if you wait, new better machines will pop up. They always do, being this a truism of a sort ...
Good luck.
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