For PDF I would definitely go with a recent (or at least no so old) Android tablet with at least 4-6 GB of RAM and KOReader. That would be best way to read any PDF document. For me PDF is a pain with E-ink at the moment. But it also depends what kind of pdf docs you read. If you don't have to scroll at all just turn pages, then Sage would be cool.
BW book reading experience is best on a 7-8 inch screen with page turn buttons (ofc ymmv). So Libra 2 if you can get it from somewhere or Sage again.
But hopefully next year kobo comes out with brand new 7-8 inch BW devices.
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