I think these internet forums are usually filled with a demographic that is overall more enthusiast than the public at large. More over, if the question was posed with an "if money was no object" the answers may have been even more skewed to the 4.8, as all of the more (for the lack of a better word) "practical" buyers would not be chiming in for the 3.0.

btw, I, being the owner of a powerhouse CDI diesel also agree that it would be a good middle choice, however it is not a choice in the US.

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BMW - X5 4.8i w/all US options packages, 19" Y wheels, White/Tobacco, Huper Optik 50% tint
Mercedes Benz - E320 CDI Park Assist, NAV, Folding Mirrors, Premium Sound, Voice Command, Sunroof, Auto Rear Shade, Bi-Xenon