I'd be interested to see where the N54 engine fits in real-world performance between the [US version] TT diesel and 4.8i. I would've easily paid the price between the 3.0si & 4.8i for the 326hp. I was complaining how $10k for the jump to the 4.8i wasn't ideal... half way to that would've been perfect for me.

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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