Kevin, I've got the XM, Had it in my 00, got it before Sirius was on the air. I have no idea how Sirius is, but I sure like the XM. I got the Sony DRN-XM01C, because it is small, and can be moved easily from trk. to car, and in the house. If you get one of these, get the DRN-XM01C2, it has a clear read out, mine is the blue and is hard for me to see, especially in daylight. Look on ebay, thats where I got mine, but the 01C2's are hard to find, cause they haven't been out long. Hope this helps. You will enjoy it, especially if you do much cross country driving. The 24 hr. weather is really nice.
Larry
BTW, Sony has a $75. 00 rebate now til 12-31-02.