I am looking to upgrade my RCD 300 , what is the best option to go for, i want multi cd & mp3 playback,, not fussed about gps,, i have read about the dreaded battery drain issue, so what would i need to upgrade is it easyish to get done,, just fancy something new in the car,, its an 07 passat 2.l tdi se will my canbus need ugrading. cheers in advance