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Don't buy an Onyx M90. It's no good, and it's no longer supported by Onyx, so it won't improve. The M92 is a good reader and still supported.
The issue of e-textbooks and PDFs on ereaders comes up every other day here on Mobileread, and if you search the forums a bit you'll find that most people will advise you to go for a tablet such as the iPad rather than an E Ink reader.
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