Re: converting PDF to mobi/epub using calibre and OCR. It's possible, but it's probably going to suck, depending on how complex the formatting is. You are going to have to OCR it in order to reflow. I've used Calibre to convert books from PDF and it turned out to be a big mess, with page numbers and footnotes mucking things up.
I would recommend a Kindle DX for reading PDFs. It won't be perfect, but it'll be much better than the 6" one.
I would recommend going to look at a Kindle DX (they have them at Best Buy, if you are in the US) and seeing what you think of the contrast.
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