If you're considering different ways to cross the Alps, take a look at
THIS SITE.
How you get down towards the Alps is up to you. You could take autoroutes all the way to Lyon, then turn left, or for much mor interesting more interesting roads work your way down the Eastern borders of France - Ardennes, Vosges, Jura and Alps - but that won't meet your needs for "fast-ish".
To get to the Med coast from the alps, you could take the Route Napoleon through the lowish Alps, ot the Route des Grandes Alps to cross all the highest passes. The RGA is really a two day trip on its own from Lake Geneva to the coast, so although the roads and scenery are top class, you might not have the time.
If you have the chance, the road from Cuneo in Italy to Sospel is fantastic. And from Sospel north is the col de something or other beginnign with T I think but I just can't remember, but it's the D2566 and the D70, is the twistiest road in the world.
So, to summarise: autoroutes or N roads or a combination of the two to Dijon on day one. I'd skirt to the South of Paris via Evreux, Dreux, Chartres, Pithiviers and Auxerre. That's about 350 miles, and the N roads are fairly fast open roads, too. Loads of choices for day two, but from Annecy you can take in Val d'Isere and a couple of other high passes on the way to Torino, although acual border crossings are limited to a choice of one or two. As it's the Alps, you might want to see how the weather is when you're there, and decide whether to take a pass of go for a tunnel (Mont Blanc or frejus).
