When I get my next X5, my must have options will be:

Adaptive Drive:
Heads Up Display:
Preminum Sound:

Personally, I wouldn't buy X5 without adaptive drive. I think it is a single option that makes X5 a BMW. I am concerned about its longativity though. I assume these will need to be replaced around 100k or so (like that Audi air drive)? I put about 20-25k a year so that may come sooner than later...

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2011 X3 35i
2008 X5 4.8i
2003 330xi -sold-
2001 X5 4.4i -sold-
2001 M5 -sold-
2001 M Roadster (SCed, Highly modified) -sold-
2000 M Roadster -sold-
1995 325is -sold-