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I think the main differences are that the Sony has a touchscreen and supports more formats, while the Kindle 3 has a better looking screen and is cheaper.
From what you've said I'd recommend the Kindle 3, mostly because of price. That seems like an important factor for you. Unless touchscreen is that important to you (and it is a big plus for some people), would you really want to spend that much more money for a screen that does not look as good?
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