upgrade or replacement

Hopefully going to pick up a MY2004 W163 on Thursday. From the VIN decoder I can see it has 352 COMAND, 819 CD CHANGER and 354 ANTENNA FOR TELEPHONE D/E NET. I have established the SatNav (if indeed it has the map CD!) is only 5 digit postcode, the CD-changer will play MP3 and I do not have...

My W214 230CE comes fitted with the standard Scorpion Alarm system. Recently it has been playing up, often not disarming, which means I need to jump in with the alarm wailing and lights flashing and manually disarm it with the physical security key. I am now looking at replacing the alarm...