The Yamaha triple is not an extreme bike, but a very good value. 115 bhp and 67 ft/lbs in a 414 lb wet package.
As for extreme, that's why I mentioned the new Ducati Superleggera. Faster than the Ducati Desmosidicci RR, exotic materials (lots of magnesium, carbon fiber and Ti) and amazing electronics. At $80K, it's definitely exclusive.