Skipping the PDF issues, which others have addressed, you're looking for a durable but lightweight reader, with good warranty support, if you plan on traveling with it for 6 months.
I would suggest, in this order:
1. PocketBook 360 - hits all your points
2. Sony Pocket (PRS-300) in a durable zip up case (it doesn't have flash expansion, but it can still easily hold 300+ ebooks, enough for 6 months)
3. Bookeen Cybook Opus - its firmware is a bit more buggy and it doesn't feel as durable as the Sony.
I know you mentioned you prefer 6" devices, but I think all three of these offer a better combination of features and warranty for your needs, in your price range. A few more page clicks to read can be offset by carrying a lighter, more durable device.
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