None.
It's an unworkable idea. Get one with a matt surface on the screen and turn the brightness down so the peak white is similar to a piece of paper in the local ambient light.
There are screens almost as good as eink. The eink is really only good for reading novels.
No wordprocessing software will paginate. Even pages smaller than the window scroll inexactly with page-up and page-down keys.
Only PDF viewers and ebook viewers will work nice on eink with paging.
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