Ooh, time for pics, me at Chatel/Torgon, which is in Portes De Soleil.
As marcdbl says, if you have the money, go for Canada, preferably Whistler. Best boarding holiday ever. Biggest credit card bill too...
In France, Val D'Isere/Tignes is huge and has some nice runs, plenty off piste too. Val D'Isere has good range of bars too. Like most places in france your appartment will be tiny but very near piste.
Portes de Soleil is even bigger, masses of resorts linked together (though some buses may be involved). All sorts of pistes. Slopes near Avoriaz get pretty busy but stay in one of the smaller villages and your local slopes will be quiet as anything. If you like long tours, not a bad choice. Its a bit low though, so don't go in April.
Sauze Doux: Drinking resort, I didn't get much boarding in.