I too have premium sound and the DVD changer... didn't really want it, but the car had every other option the way I wanted it. I'm eagerly awaiting the new Invision entertainment specs. I'm hoping it will have an option to play DVD's from the front factory changer to their rear screens. If not, I'm tempted to pull out my screwdriver and tinker around with it.

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2007 X5 - 3.0, Space, Black Nevada, Bamboo, Premium, Tech, Rear Entertainment, Running Boards, 3rd row, Sport. - BMW buy-back
2007 X5 - 3.0, Space, Black Nevada, Bamboo, Premium, Tech, 3rd Row, Sport, Comfort Seats, iPod - ordered since 8/8/07, arrived DOA 10/23/2007
2008 Acura MDX Tech Entertainment...11/07-04/08 LOL!
2008 X5 - 4.8, Space, Black Nevada, Bamboo, Active Seats, Premium, Tech, 3rd row, iPod, Sport w/20's

2007 335i Sedan - Graphite, Gray Dakota, Aluminum, Tech, Sport, iPod.