I've been looking at the Cup II (993) wheels for mine, they're only a little wider and look great. If I had a little more money, I'd be looking at the Cup I (964) wheels, they're the same style as the ones on the Boxster concept car.
Cup II:
Cup II again:
Cup I:
This is the only picture of Cup I's I can find, I suspect it's because of their price/availability.