We ski Luz Ardiden regularly, a great small resort with nice snow park and good runs. It's a good family station with some challenging pistes as well. Snow is generally good and you are not in the Alps, which is great. It's less busy, cheaper accommodation and food. A popular station with the Spanish and for good reason, the town and surrounding area are beautiful. From Luz St Sauveur you can ski, Luz, Tourmalet La Mongie, Gavarnie and Cauterets. Also many natural hot springs with luxurious thermal baths in the area. You can buy combination Thermes/Ski tickets.
Skied up at Luz for 4 days in Feb 2007... they had not had a lot of snow; about 70% open. Compact little resort with few facilities - the ski station is a cafeteria and a couple of hire shops next to a car park. Skiing I thought ok for size, suit beginner/ lazy intermediate. Couple of nice reddish black bits.
Charm really lies in skiing out of the Alps - a coffee on the slopes cost me 2E. People friendly, no queues, surrounding area beautiful. You can easily get to Bareges for more extensive skiing or round to Cauterets.