ebay is always good for OEM radios really cheap, people getting aftermarket radios, looking to recover some expense by selling the OEM one they took out.
Check out everything, just because its satellite, doesn't mean it automatically has world wide coverage. As well, radio may work off a different standard in the U.K. then U.S., don't know the specific, but would NOT be surprised in the least if a U.S. radio would NOT recieve any stations in the U.K.
First talk with the dealer, I think for 2006 you'll be OK, but in 2008 or 2009, Chrysler went to even more digital network design, using the CAN Bus, and locked it all up in a tight proprietary drum. NOT sure on the year, or any, this changed, but it can complicate aftermarket radios, features or retro fitting features to your vehicle greatly. But, this system can complicate changing radios, features or using aftermarket radios, including having to have the dealership use special tools to reconfigure computers to make things work properly.
Arguably, this improves anti-theft features of the radio, because the dealer will check if the radio was stolen before enabling it.
There is a forum here, "Electronics/NAV Discussions" forum, I'd ask the question there, might get better responses.
I looked into retro fitting the Bluetooth hands free module to my 2010 Commander that has the right radio to work with this kit Chrysler sells as a retro fit kit. It won't work after installing it and will have to be brought to the dealership for them to use their proprietary tools to configure the radio to work with it. According to the instructions, the dealer only needs to perform a 1 minute procedure with the tool, but most dealerships will charge at least $100 to do this. How this improves anti-theft is beyond me.