Klaus,
I have been waiting and deciding on which way I want to go. Can the current ONstar antenna on the 2003 be used for XM instead of GPS? Also I am not electronically inclined so I would like to have something that is easiest done. I want the 2005 touch screen w/ XM radion the GPS is not a big issue for me. Unless you plan on taking any trips to Myrtle Beach soon I can let you install mine for a fee$$ of course
only a few hours up the road for you.
Thanks Ron