the new idrive with its nicer display, better/faster interface, and harddrive for storage is a big deal in my opinion... I'd definitely wait for that. The other big deal would be the twin turbo 6 engine. I wouldn't wait for a facelift though.

In a way I'm sort of glad I didn't wait for the diesel like I wanted because now that the diesel is out I would definitely want to wait for the idrive. A Jan '08 purchase would've turned into a Sept. '09 (?) purchase - way too long for me. You have a much shorter wait right now... just go the distance since it's obviously important to you. I wouldn't want to be stuck with the old idrive in a brand new car now.

BMW is definitely good with staging new features. My service advisor even said that in our last meet... they always get you...

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr