Having just purchased a used Sony 505, I am relieved that neither of these offers enough for me to regret the decision. The 600 is not for me as I don't really want a touchscreen reader. I'd be very interested in the 300 (really like the idea of a having a 5" reader) if it had a card slot and page turn keys, but it doesn't.
For me the biggest concern is long term support for common formats as they emerge and the possibility of firmware upgrades to support these will only happen on the newer readers.
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