You may also want to consider a tablet, should the e-textbooks be in PDF format. As you've already figured out, a 6" screen is often inadequate for large PDFs.
If you buy a Kindle, you can only read Kindle books or DRM-free books, unless you break the DRM. However it is against forum rules to explain DRM-stripping in detail. I am not sure if Amazon's e-textbook offerings are available for the Kindle (as opposed to Kindle for PC) anyway, though.
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