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You will have to weight or set your #1 priority here.
If you need and outdoor/indoor device, you have only once choice: eink. But the problem is that Kindle DX is the only with the biggest screen among eink devices however, it does not read ePub but MOBI or AZW. So, unless you 100% really need access to public libraries and ePub ebooks, I would suggest Kindle DX, because screen size, access to Amazon store (like you mentioned) and PDF capabilities. Sony handles PDF pretty well but you won't have access to Amazon books.
There is no perfect device but if you choose one based on the kind of books you read and like. you will have an ereader for years...
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