What roads did you guys already drive in Austria? The curves! magazine I have here goes straight through Austria, with a small detour through Slovenia and ends in Triest in Italy... maybe that's interesting aswell.
The route starts in the west with the Hahntennjoch and Silvretta-Hochalpen-Straße and then works its way through the east via Timmelsjoch, Jaufenpass, Gerlospass, Großglockner and ends with Nockalmstraße, Turracher Höhe, Wurzenpass, and in Slovenia with Vrsic-Pass and Mangart-Sattel.
I haven't driven any of that yet, so can't comment on the quality of the ride.
These are the last ideas I can contribute (and they're not even mine, just quoting curves!).
I'm open for everything, as long as we have fun.