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Suggest you check current colors on high end cars an wheel companies for latest trend. I like a low gloss. Matt wheels on the road look dirty to me and high gloss tend to be too much of the focus. I went with a graphite gray that closely matches the wheel well trim and hue. If you go gray be sure to test the color next to the color of your X as the hue can be black,green etc. so some grays will look good and some won't.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas