I was a big Michelin Primacy fan with the E53 and recently went with the Pirelli Scorpions on the E70 because they were a lot cheaper and I was replacing some really crappy Cooper tires but if I had to do it again I would have went with the Michelins because I think they are a bit quieter and ride a bit nicer. I'm actually going to have a look to see if I can 17" wheels onto the E70.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)