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WiFi is cool but it's not available everywhere as you say. 3G is close to ubiquitous. I used my Kindle 2 and the Wikipedia function travelling through the mountains on a bus to Guadalajara recently. WiFi won't get you that!
But also consider this: most of the time you are reading, not downloading. So, generally, there is always lots of stuff already on your ereader even if you're not in range of WiFi or 3G. 24/7 connectivity isn't a "must have".
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