PDF reflow works fine (although it doesn't preserve formatting and can mess up tables and equations!); ePub doesn't fully justify. I would go for a 505 or the slightly smaller 300 before the 600, unless you really want a touchscreen and dictionary lookup. If you just want to read lots of books and borrow from libraries, then the 505 (6") or 300 (5") would be my choices. You might want the larger screen to better view technical docs.
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