Me and 3 of my mates went to Pas De La Casa (Grandvalira-Pas de la Casa) in late January and what a week it was. The snow conditions were perfect; some pistes left unbashed for powder loving snowboarders, and the well used and long runs prepared perfectly with a dusting of fresh snow on top. Ideal conditions for both skiers and boarders. I don't know how they were grading the runs, but some blues should have been red, some blacks should have been blues etc. But there is something for everyone at Pas de la Casa (Grandvalira-Pas de la Casa) and the wide slope back into the town centre is perfect for beginners: not too steep and nice and wide for turns. Away from the centre there is a huge snow park, with jumps, rails and half-pipes, with DJ's playing all around, brilliant.
Now the important bit, the night life. I have never been anywhere quite like it. There are so many bars you will need more than a week to get to them all, and the 2 clubs are always a good laugh. Get to the happy hours to get the night started as beers were about 3 euros. Plenty of good places to eat out, make friends with anybody and everybody, keeps drink and food prices down.
All in all, Pas de la Casa (Grandvalira-Pas de la Casa) is a great place if you're going to get up late with a sore head, ski or board 'til your legs hurt and then do the same all over again.