Michelin Power One For track day and dry weather only. I really like them, great grip, take a few rides to get used to but well worth it. Only downside is the price ($350)
Michelin Pilot Power 2CT. Had them on for 2 seasons now, and I really like the tire. Much better than the Battlax that were on the bike from factory.
Diablo Supercorsa... fantastic tyres, also Dragon SC were fantastic. I got my RS250 since 2006 and I have always mounted Pirelli tyres.