I vote for the Brushed Aluminum. IMO it really looks good with the light grey interior.

But then, I'm biased... (see sig )

__________________
'05 X3 3.0i Alpine White/Gray Leather/Alum. Trim
Sport/Steptronic/Servotronic/Panoramic
Prem. Sound/Staggered 18" Style 114 Y-Spokes