Just for PDFs, take a look at Pocketbook 301+ forums. It is, in my opinion, the best PDF reader in the 6" class. I use it mostly for technical documents, heavy mathematics with graphics and it's great because:
1. Landscape mode with cut margins
2. Multiple-column mode (great for A4 or Letter sized papers)
3. Really portable, unlike 8" or larger screens.
Good luck in your choice!
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