Many members here have switched to the Continental Extreme Contact DWS with great results. They are currently less than $1000 for the set at Tire Rack. They also have the high end Conti Sport Contact 5 SSR which is a RFT for around 2k. These are the 20's, I'm not familiar with 21's.
I run Contis on my M3 and have been very happy with them.
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'10 Space Gray, Cinn Int.
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