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All the current range of touch-screen eInk devices use the same infrared touch screen technology, hence they are all equally sensitive. It's not actually necessary to touch the screen at all; the invisible grid of IR beams is about a mm above the screen - all you need do to turn the page is to break the beam.
It's more a matter of whether you're happy with a purely touch screen device, like the Kindle Touch, or whether you also want hardware page turn buttons.
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