It depends on what you're looking for in an e-reader. If you like the UI and hardware design of Sony but value contrast above all else, then the 505 is the better pick. I tried to use a 600 after owning a 505 and couldn't get over the 'faint' appearance of the text.
Brand-new 505's go for $300-$400 regularly on eBay, so there is a market actually willing to pay more for it than the 600.
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