PDF rendering is a software problem, not hardware.
Evince and
xpdf can render PDFs quite well. Xpdf is particularly good because you can override the background color with something better (less harsh) than white (if you want to read on an LCD).
For hardware, I recommend the
XO-4 Touch. It has a gnu platform that can run the above pdf apps, and also has a dual-mode (pixel qi) display, which has both an e-ink mode and a backlit LCD mode.
BTW, you might want to consider security. PDFs can be infected with malware that becomes active by simply opening them. One control is to setup a vm strictly for opening untrusted PDFs, and for each PDF you first clone that vm, use it to open the PDF, then destroy the vm clone (which you assume to be infected). In light of security issues, I doubt you can use any of the other readers mentioned because they probably don't sandbox the PDF.
Quote:
Originally Posted by ProfCrash
Learn to convert formats. It is pretty easy to do. Google it
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Converting a PDF into another format is like starting with ground beef and trying to get a cow. PDFs are a formatted document with the markup absent - and may even be a sequence of raster images.