Picked up a new set of rear Hankooks. Looks like I'll get about 15,000 out of this first set, fronts are still good. Hoping the fronts wear out the same time as this rear set. Not quite the mileage I was hoping for out of them but better than some I've seen. They are so much quieter than the Potenzas it came with. Handling isn't quite as quick on the Hankooks due to less stiff sidewalls but I'd take the tradeoff for the quiet ride any day. They still work great and once you get used to them you don't notice the handling difference. $360 shipped from Discount Tire.
http://mrmaico.smugmug.com/Cars/BMW-.../IMG1273-L.jpg