As the others have said, if you're happy with eInk, then get the Kindle - it's easy enough to use Calibre to convert non-DRMed books from ePub to Mobi format, which the Kindle reads - you can get non-Amazon books onto it, you're not locked it to a single source.
If you want a tablet though, the others are both good devices - if you've not got an investment in either infrastructure, then I'd probably go with the N7, particularly for using out and about, although there's not a lot in it.
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