I just had the Sirius satellite radio installed in my '04 Lincoln LS with the navigational system. It was a long, rough battle to find out what I needed to do to get it done.
When I originally wanted to get it, I contacted the dealer, and they had no idea what I was talking about. I had to show them the owner's manual to prove that it was a possibility. Next, I called Lincoln, and the first person I talked to referred me back to the dealer. I called Lincoln again and found a knowledgeable person who referred me to Visteon, the manufacterer of the radio. Through them, I found an aftermarket installer that could get the job done for me.
After all of this, I have to say it was worth it. It's nice to have a fully integrated satellite radio in the system, no extra wires, or pieces that you have to deal with. The worst part was the antenna. It's black and doesn't fit the design of the car very well. Oh well.
The radio works great and has the same look and feel as the other audio system screens. With the software upgrade, there are some additional options that weren't there before in the navigational system, so that's pretty cool I'm still working my way through the various options, but I would say to go for it. Check out evisteon.com, take their Mobile Electronics menu option, and find a local dealer. That would be the way I would recommend you proceed.
Thanks,
Ray.