If your documents truly need to be confidential and you want to use the Kindle - I'd recommend getting the Kindle, registering it, then turning the WiFi/3G off and never turning it back on again. Utilize the USB cable and sideload only.
As for the PDF on the 6" Kindle. Not my favorite. Is it possible to save those .doc files as html, then converting that to mobi? I've had much better results with that method than trying to read PDF files on a Kindle.
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