I agree with HarryT that no 6" EInk device is a good choice for PDFs. However, some are better than others, and two with relatively good support that meet your other criteria are the PocketBook 302 and the BeBook Neo. The PocketBook's resistive touch screen (like the PRS-600) is probably inferior to the Neo's Wacom touch screen, but the PocketBook is more hackable and has the best available PDF support on a 6" EInk device.
Both of these are better than the PRS-600 for PDFs, because the Sony does not have persistent zoom.
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