I'm more a traditionalist. See bmwstylewheels dot com for the OEM options. You don't say what your existing wheels are, or your goals. If you are upsizing for appearance sake, and you are prepared for the cost of more expensive/staggered tires, suggest you watch your local Craigs' List for sales of the larger OEM wheels, and save your $$$ for replacing tires and other maintenance costs. Otherwise, strictly a question of taste.

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.