After an interesting few days I thought I would add a comment re tyres.
So far, I have used OEM bridgestones, Michelin Pilot Alpine winter tyres and the above mentioned sessantas, which came to me nearly new on a set of wheels I bought from another member of the forum. The refurbished wheels are great, the tyres less so.
In the dry they are not too bad though they break away more easily than either the bridgestones or the michelins. In the wet they are crap. No other way to describe it, seriously lacking grip.
So, do your research and decide what's important to you. I certainly won't be buying another set when these wear out, which frankly, they way they spin, won't be long.
Jon