Another problem with the route through France, Switerland Italy is Milan is a nightmare to get through also and many people avoid that route.
The route that Eco points out is by far the best way, we do it twice a year. There are loads of places you could visit, it is a matter of choice and what interest you most as to where to visit.
A vignette is needed to use the Austrian motorways but can be purchased at the garages before you enter Austria they cost Euros 7.70 and the Brenner pass Euro 6. Its the cheapest route also.
We have just driven this route last week so if you need any info on it. Please pm myself or Graham.