The 8100 appears to be a better version. the extra features are 8x digital zoom (instead 4x) miniSD add-on memory and bluetooth. i would go for the 8100.
here:
http://www.camphonereviews.com/phone.jsp?model=LG%20VX8100
compare them both.
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I have finally come donw to choosing the 8000 or 8100, I hear that the 8000 gives better reception, and you can record your own ringtones, but the 8100 is a newer model. But is newer better?

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