Your first season I guess?
I wouldn't recommend Chamonix (spent 3 weeks there). Sure, the skiing is great, but the crazy queues combined with the constant need for getting on packed buses between the areas (around a 10-15min ride from Grand Montets - Flegére(Chamonix)) is not my idea of fun.
I spent the 12/13 season in Val d'Isére(L' Espace Killy), and had a crazy fun time. Superb skiing, no queues if you avoid the obvious places(bottom Solaise early) and a great partyscene. Perhaps not the best place for skitouring, although I can't really say since I'm not into that scene.
I can guarantee you wouldnt be disappointed with the setup. Decent opportunities for work aswell in case you don't speak French, many English/Scandinavian bars/tour operators around. It is really expensive though (uphill food etc.), but as long as you stay clear of 15euro pizzas you should be fine. For drinks, be sure to check out the 2euro bottles of drinkable rosé at Sherpa.
Heard great things about Val Thorens aswell as Serre Chavalier aswell, although I've never been there myself. Incase you end up in Valdi, gimme a shout and I'll try and point out some lines!