Thanks for the input about the SSRs. I've read that they aren't strong but then no real episodes of them breaking so I'll place this idea in the category or urban myth. Now, if I can remember how to work Photoshop maybe I can come up with a picture of them on the M3. Oh wait, tirerack already does this. I'll be back.
Edit: I'm back. They look good on dark colored cars. Only available in 18" and fairly cheap. Unfortunately, tirerack only has a picture of the 335 sedan, not the M3. And they don't have the Jerez Black color for it either. But it does give you an idea how it looks.
I've been assimilated. 6MT/ZPP/18"/PS extended.