in my opinion if you aren't keeping it for a long time, the new idrive isn't a must. If you are, I would rather have those new capabilities by a long shot. Storable music, faster nav/response, sharper screen... yes please. We're talking living with the idrive for 10+ years here. The wait is a different story, tough choice right now. I'm glad I'm not in your shoes, sort of.

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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