Recently replaced the OEM tires (Goodyear Eagle RS-A) on my '05 530i with Bridgestone Potenza RE970AS Pole Position and I'm VERY happy with the change. As expected, the higher load & speed rating (98W vs 94V) resulting in a firmer ride with more awareness of road imperfections (potholes, etc.), but the improved handling & steering response was a worthwhile tradeoff. Very low tread noise was an added plus.
Be sure and checkout Tirerack.com. It's an excellent source of info on tire test results & reviews.
Last edited by turnbowm; 11-16-2012 at 09:28 AM.