Project objectives

My main objectives for this project are:

• Add GPS navigation to the car
• Integrate the XM radio (get rid of the separate receiver)
• Maintain an AM radio
• Stealth installation
• Most importantly - be able to upgrade any piece of software anytime I wish
  

I really like one of the local AM stations, which incidentally has the best traffic report for the area (no contest), so I want to keep an AM radio. Also, since I frequently park in the city and sometimes drive co-workers & customers, I want an inconspicuous installation that won't draw shady eyes (or trigger a recurring Car PC conversation every time someone new rides in my car).