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A 6" inch screen e-ink ereader will not work well for most PDF files. The screen is simply too small. A 10-inch tablet is best, like the iPad, but that is not within your budget. I don't know about other 10-inch tablets, because I already have an iPad.
Most ereaders have at least wi-fi available. A few have an sd card, but all support side-loading via USB, as far as I know.
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