it sounds like you'll be in good shape opting for the 08.. many software updates and other fixes will be incorporated into the new year...

I'm waiting for end of Oct, early Nov to place order...(want to make sure I'm close enough to getting the auto tailgate option)

anything soone and it may be built before it's available...

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2012 X5 50i M-Sport
2014 X3 35i M-Sport