I would suggest the Michelin Latitude. I researched the forums and read reviews in various retailer sites and the latitude seem to be the best tire quality and minimal road noise. I purchased the Michelin Latitude about a month ago and they have been great, except for a minor air leak to one wheel, that is not related to the tire!

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2008 X5 3.0si |Space Gray | Black Int. | Bamboo Trim | Premium Pkg. | Premium Sound | Sport Pkg. | Tech Pkg. | Entertainment Pkg | Comfort Access | Auto Tailgate | Rear Climate | iPod | Satellite/HD Radio |Style 214 20's on Michelin Latitude HP