I chose XM because...

Sirius wasn't working yet when I got XM.

Pioneer was the only company that had the complete package I was looking for (head unit, in-dash CD changer, and XM).

Pioneer makes some of the best automotive stereo equipment out there.

I believe that of the two choices, XM has a better chance of surviving, though both could go under easily.
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy