I'm in the same position, myself, and I just started looking at potential candidates - to me the Samsung Galaxy Tab S5e seems like a decent choice (the newer S6 is a lot more expensive without really justifying its price for my use cases) - might be worth considering for you too since it seemed to fulfill many of your requirements.
To be honest though, I'm not really a tablet guy so hopefully someone more knowledgeable can chime in as well!
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