I actually had the same dilemma... but i had a Merc E AMG... now, the reason i bought the X5 4.8i 2008 is because quality ratings compared to the RRS... and also b/c of the following
X5 4.8i 6.3 secs 1-60
RRS Supercharged 7.3 secs
RRS non supercharged 8.4secs
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