I'm afraid if you want a decent device, you should wait. Nothing on the market is good enough for any sort of demanding use. They're just expensive toys...mostly only for reading low quality books. Further, if you get A4 PDFs, don't waste your time with small-screen readers since they don't have sufficient contrast or resolution. Contrary to what some say, e-ink isn't like reading paper. It's more like reading a calculator with slightly higher resolution and contrast.
Unfortunately the best solution for large pdfs that require navigation is still a PC of some sort. A netbook or tablet is a much smarter buy at the moment, and I don't expect any great ebook reader solutions will be available within the next year or two.
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