Get a Loewe or Lear amp, they are newer. The Lear amps are the newest. Any DSP amp will work in your car, but I recommend you get it coded.

Here's a write-up that talks about the differences.
http://bimmerboard.com/forums/posts/204027/

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input