Hands down: Zurich.
One of the most stunning places in the world. Expensive, to be sure, but what you get for your money makes it worth it.
Negatives: Don't expect to make friends, so try to find other expats. And you'll always be a second-class citizen if you're not Swiss (with the right name), learn to live with it. Rains a lot.
Positives: Everything else. Clean, safe, perfect hiking and skiing (and even swimming in summer), the public transportation couldn't be better, etc.