The only difference between stadnard and XT is that XT comes with
bluetooth audio, 4 GB of built-in storage, and an FM radio. For that,
you pay $135 extra (more when the prices go up). From the accounts I'm
reading, seems people are having some small issues with XT. Nothing
insurmountable, but IMO those features aren't worth $135. They aren't
to me, anyway, which is why I bought the standard version.