I just got a Sirius System.............
But in hindsight, which tends to be 20/20, I would have probably done the Sony XM, cuz then you only have to buy one head unit subscription. The Sony system allows you to swap the XM unit from vehicle to vehicle to home, etc. You just have to buy the extra mounts and antanaes. I was talked into the Sirius (Kenwood) at Audio Express, they said XM was starting to play commercials and Sirius had a better selection. Regardless, I like mine. The comedy and rock-n-roll stations kick butt. Total cost was @ $750, installed.
Are you looking at the one that plays through the FM side of your stock radio or the cassette tape adaptor setup? Let us know how it goes, I may sell mine and go to the Sony w/XM.