I have the 1350, gives just a bit more juice, but I think optimizing your settings (i.e. how often you select to retrieve email, WiFi on or off, etc) makes a bigger difference in usage times IMHO.
The extended life battery that is coming out is probably somewhere in the 2000+mAh range and will be bigger than the stock battery and will probably come with a modified back cover. No word on whether the new back cover will work with touchstone though.
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