Ok, so heres what I plan on doing. I plan on buying the Pioneer Avic-D3 from Best Buy for about $400 (Employee discount off a friend). Now, I'm just curious to know if anyone here has installed one in their x5.

BTW I drive a 2001 x5 3.0 with factory stereo options (including the outdated nav unit). I'm adding an Alpine PLV-7 in the trunk in the near future, so I just wanna know what everyone thinks about it. If you do know anythign bout it, please comment on the built in amp (4x50 watts).