If the PDF is a scanned image of a manuscript or book, then the best Eink screen for you is the Iliad. But if it's a journal article that was published in PDF, then the Kindle might work for you. They are indeed beta testing a PDF conversion service.
I don't know for sure that MOBI files will work on the Kindle; all the ones I have to test were PRC. MOBI probably will work. And yes, there is a DRM stripping tool for Mobipocket. I don't have it.
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