I used to always rent a car unless going to St. Anton or Zermatt where it truly wasn't needed. Priceline became my friend and was usually the cheapest way to rent. The trains cost real $$$ and the fellas are spot on in the advice. Easy from Paris to wherever just don't plan to switch resorts. I think the Serre Che, La Grave, Alpe du Huez corrider really almost requires a car to sample all the goods and be able to have any kind of flexibility as to when and where you ski, much less getting from there to Cham.
He who has the most fun wins!
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