The font of all STW knowledge for skiing!
I've used Crystal and Neilson in the past, and been impressed with both. Crystal had marginally better flights, Neilson marginally better in resort.
As ever, I feel duty bound to recommend the following;
Hotel Plein Sud, in Serre Chevalier.
Awesome little place, easy walk to the lifts (Leave your skis/boots in a locker at the foot of the slopes for extra ease). Superb food, really superb in fact.
And, Serre Che is a lovely place to ski as a couple. Lots of mixed ability terrain, loads of great places to eat on the mountain, etc.
Also, nice short transfer!
Later trips were with BA, as I had airmiles to use. Much better flights (And baggage allowance!)