Before the big incentives of mid-year onward, I asked on every of my test drives which have been selling better and it was always the 3.0si.

I think the bonuses of summer got a lot of people onboard with the 4.8 as it was definitely a worthwhile price. Some were getting it shy of the $65k mark. I ended up spending $61k on my 3.0si after everything so it goes to show you how nice it was. I wouldn't trade those 6 months back though.

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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