This is all really good advice. Driving can be a really good option as long as you have...
1- plenty of entertainment, food and drink for all involved
2- good directions/ maps/ sat nav
3- snow chains are a must (and avoid buying them once in the mountains as they take advantage of that)
4- make sure you have all the bits that the French authorities require (triangle, high viz jackets etc) as well as a few Euros!
I run a specialist ski travel agency, so do get in touch if you need help with the accommodation side of your trip.
www.summersandwinters.co.uk
Have a fabulous time.