You have three options:
- BMW OEM iPod Integration
- DICE Silverline
- Intravee + Alpine KCA-420i

You can have a lot of info out of this forum http://www.xoutpost.com/bsws-mobile-electronics-forum/

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BMW 1M 2012 - Current
Jeep Grand Cherokee Limited 2011 - Current
BMW E93 330i Convertible 2009 - Sold
BMW E46 320i 2004 - Sold
BMW X5 4.4i 2002 - Sold
VW Golf GTI 2000 - Sold
BMW 740i 1996 - Sold