I just replaced my tires and went to the all season sport Continental DWS 06's versus the Bridgetone run flats I had on it. I got around 40,000 miles on the run flats and these are supposed to be 50,000 mile tires. I like them so far (traction, stability, noise and ride) over the Bridgestones. I paid $1050 for the set (I have 20" M Sport wheels) which was a savings of around $300 - 400.

I have not had the need for the run flats yet and my vehicle comes with a spare tire kit. I have a small air pump, fix a flat can and the tools to plug holes so my need for run flats wasn't prevalent. For those reasons I went with the all seasons. Also the lips on the continentals help prevent curb rash as they protude past the metal lip.

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2013 X5 M-Sport 3.5
2008 128I Cabrio
2007 335I Sedan (sold)