^ you will save some $ with the diesel for sure but with the 4.8i you win at everything else. You're getting it soon and once you do, you won't think twice about the diesel as you'll be on top of the world from the word GO. I test drove that 4.8i to feel the differences... it was a true beast. Good luck with it.

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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