The "flash" turning pages is inherent to the current implementation of eInk screens. You will not find a device without the "flash" turning pages right now. The Kindle DXG is fast and while it still has the "flash", it is not as bad as other devices. I would say the DXG is probably your best shot, especially if you read PDFs. Storage is limited, however, with about 3,000 MB available for user content. No slots/ports for physical add-on storage.
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