>At first glance, it seemed like SIRIUS was a better fit for me. But then I noticed that the Bob Costas radio show (which I love) is only covered on XM Radio, and that Pioneer has a great portable player for XM Radio.
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>Anyone using one or the other?

I've got Sirius. I can't imagine having to listen to "normal" radio anymore. I know a lot of people can't imagine paying for radio, but being able to listen to music without a commercial every 10 minutes is HUGE, especially if you listen to the radio for more than 10 minutes at a time. You also have a much larger selection.