Depending on how tidy a job you want really. I've managed to intergrate loads into my 96 A8, Playstation 2, nokia phone charger and 2 x small screens with dvd player.
I put a 400w inverter in the rear footwell running off the rear cig lighter, that the power sorce for the phone charger Playstation and the likes. DVD and screens will work on 12v so again fag lighter. All of these can be intergrated into my bose via one of these including my phone and laptop for MP3's
Another quality install by Dezzy