Hi Guys,
I've just ordered a Bluetooth kit from Baverian Soundwerks in Atlanta,
http://www.bavariansoundwerks.com. for about £450, including shipping of about £50. Give Micah a call, he'll tell you what you need.
I have the same car as Jeremy but with a factory fitted phone installation and that dreadful Motorola V50. I have bought what is called a ULF kit from Micahs company. Should arrive this week. I'm no 'techie' so I'll let you know how easy it is to fit! I had no idea about any of these things until I discovered X5 World. Now I have a MKIV sat Nav computer (bought on ebay) and the latest software plus speed camera locations. Next project will be the sound system! Probably never see a return on these investments if and when I sell the car but it keeps me happy!
For more info, have a look in 'Forum' under 'Electronics'.
Hope this helps, JG