If you hadn't said that LCD is a no-go I'd say take a tablet.
Chances are that even a 7" tablet will do better for PDFs than a 9.7" e-Ink reader.
Why don't you want a LCD display? Most advantages beside battery live are at least debatable.
Secondly what PDFs do you want to view?
- mostly text
- text + mathematic formulas
- text + pictures
- text + anything with colour
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