A question that's very often asked, and I'm afraid the honest answer is that this is something that eInk devices are just not terribly good at. PDFs take a lot of processing power to render, and eInk devices have very slow CPUs and really aren't up to the job of rendering complex PDFs. Most people (myself included) will recommend an iPad or equivalent Android tablet to you for this purpose. For me, an iPad with the "GoodReader" App is hard to beat.
If you absolutely must have an eInk device you need one with a 9.7" screen. The Onyx M92 is probably the best.
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