In reply to Birks:
As everyone has said, Visite is superb: the most fun I've had on bolts in the Alps. I recall there being one short bit of 6b (P5), maybe 6a+ on the slab high up and a lot of sustained 6a. However, I'd recommend having a grade in hand, as there are some big run outs, particularly early on!
Like almost everything on this magnificent mountain, the Madier is also excellent. As you say, mostly VS apart from one pitch: the crux fissure, for which E1 is probably fair. When we did it, there was a bolt or two on the fissure and the odd peg elsewhere (in addition to some belays), but you certainly need an alpine trad rack.
Voie des Savoyards is also a very fine route. I still kick myself every so often for falling off the last move of the crux traverse high up. It's great climbing, but it's never 6a! If I had the chance to do it again, I reckon I'd try to talk the second into carrying both sacks!
Post edited at 10:08