Couloir was ok. Not sure what it's like later on in the evening, but a good laugh after a few.
Le Studio (at least I think it was that one) is probably a good place to start.
I was pretty disappointed with the bars in Tignes to be honest. Either we were going out to early, or the resort was quiet.
Not that that mattered too much to be honest. I'm usually knackered after a days skiing and only fancy a few beers in the evening.