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Depends. I wouldn't buy a 600 because I don't like touch screens, both in appearance and durability (they just don't get along well with french fries). I love my 505; if it dies, I'll be hunting down another 505.
So it's up to you, but I wouldn't make "only $20 more" a factor in the decision. Get the one that has the features you want. Over the lifetime of the device, the price isn't going to matter all that much either way.
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