If you need to read large format .pdfs (letter or A4 size), then the best option is to get a Tablet PC for use as a reader --- no e-ink though, and LCD display, and battery life doesn't compare of course, but one does get colour and the (much) larger display.
I have a Fujitsu Stylistic in addition to my Sony PRS-505 and which I read a text on is determined by whether or no it's workable on the Sony, if not, the TabletPC is my fallback.
William
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