I love my kindle3. I had a nook before and can't speak to the Sony.
I don't use my wifi but every so often, it's more of a bonus when I need it. For me the battery life and the weight are the real winners.
They both seem to be good reading devices for you. Maybe you should make the decision based mostly on which ebook format you already have. I had to convert my .epub to .mobi and I'm still not finished.
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