The only thing with that is that on the head unit it'll display "CD-C" whereas if I had a factory install it would display XM channel/artist/song. And I have to find a place for the bulky SkyFi2.

But I'm leaning towards that too Especially since I have no idea what's involved in the factory install and it's a pain in the ass finding an 04+ stereo because the 6MT has a unique stereo (180W v 120W).