Soldato
Can't do the UCPA scheme. Irritating...
I've had a look and Three Valleys/Val Thorens looks good. I forgot to mention that probably the most important factor is ski in / ski out location for the accomodation (or very short walk).
Could try Les Menuires? Just down the valley from Val Thorens and usually cheaper. Easy access to the Val Thorens ski area (and the whole 3valleys area) from lifts in the village too.