In reply to Carless:
It probably depends a little bit on what you define as a good tour. Going up big peaks? Wide powder lines? Tree skiing? Couloirs?
Saas Fee is good for some nice 4000m tours, especially if you can negotiate one night away in a hut.
Verbier has some nice day tours, like Rosablanche, and also some extreme stuff like Bec des Rosses as well as easily accessible side country/itineraries. If you have a car you could do some fun tree skiing in Champex Lac too.
Gressoney has a very high cable car station that accesses a bunch of great tours, including a bunch of 4000m peaks.
I've only tried side country in Zermatt, but with so many accessible peaks there must be some excellent tours there.
Those are the only places I've toured in in the Alps.