I think it depends on what features you like on the PRS-600 that aren't available on the PRS-505. I've seen reviews of the PRS-600, and while it looks good, the screen on the 505 is certainly better. I love the 505, and I'd strongly recommend it for a good, no-nonsense ebook reader with pretty decent multi-format support. It lacks, annotations/notes and a dictionary, but these are features that I don't really need on my reader. If that is okay, then it would be a great choice for you.
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