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It's not a necessary thing - most of my books get purchased via the computer and downloaded to Calibre first anyway. If the price difference is important to you you will most likely do just fine with the WiFi version.
But 3G is kind of nice to have when I'm away from home and get an itch to buy a new book.
As for using it to surf the web and check or things like that - I never use those functions. To slow and clunky.
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