I have to agree with Cope. Being based in Tuscany, in Italy, I have lots of nice roads in the hills nearby, not necessarily the famous ones like the Passo del Muraglione, and loathe the switchbacks: too much of a struggle on a big twin, (SV1000), much better on a 4 cylinders. Flowing stuff is much much better, like the SS74 road from the lake of Bolsena to the sea. I agree with Thoppa, Badia Tedalda is a really nice bit, not too twisty, you can carry some corner speed. Plus, I too have been blown away by the SchwarzWaldHochStrasse, in the Bavarian Black Forest, which ends in the fantastic sweepers of the D500 in Baden Baden.
Oh, and the Grimsel and Furka passes are fabulous, too. Definitely NOT Stelvio.