In reply to Dale Finnie:
Of the things I've skiied myself, definitely Breithorn, Castor/Pollux, Piramide Vincent, the two Fiescherhorns, maybe the Dufourspitze (but was too icy for us to climb it!).
The whole Finsteraarhorn/Konkordia/Monch area is probably better in the ski season, though not necessarily every peak.