I've been using Diable Corsas on my 748 all year and rate them very highly. Used mainly for fast road and 1 track day this year, more grip than I can use that's for sure. Sort of used in the wet on a return journey, but took it easy, so I can't vouch for wet weather performance.
Good deals can be had here:
http://www.fwr.co.uk/ But if Tyreman is still around - not sure of his prices....
Ade.