On my X5 4.8is I went to the Continental EXTREME CONTACT DWS. THe old Michelins were like $500 each for the back. The Conty's were $200 or somewhere around there for the 315 20inchers so that save my bacon. The DWS stands for Dry/Wet/Snow So I could use them instead of having to pay for a separate set of snow tires. When I got the 2006 X5 4.8is there was no real replacement for those mischilins and they were summer only.
The Conti's are replacements for the michilen Pilot Sport and I am thinking about putting them on my carerra S

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2011 X5M
2006 X5 4.8is
2009 Porsche 911 PDK