If you want to spend the money you can get a crazy set of asantis specially made, or if you want to spend more money go for the HRE's or even the rinspeed 23's would look really good but dont know about practicality of those wheels........ac's came out with new 22;s that look damn good also!

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" Despite its supercar attributes, the M5 still doubles as a soberly practical, spacious saloon - only with the ability to scare four passengers in comfort all the way to the local coronary unit". Top Gear