Three reasons why I am going to upgrade to the 3G:

Mobistar - iPhone3G
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1. 16GB: seriously 8GB is really too small if you start storing some videos

2. GPS: Because Location-aware Services is going to be so big on this device … accuracy matters

3. 3G: Altough Edge was not so bad after all, the 3G speed enhancement will make such a difference for power users