My current Federal 595RSR tyres are getting a bit hard and close to their wear limit and have been saving for a set of better grippier faster tyres and have decided to buy Nitto NT01 225/45/17's as have been informed that Toyo own Nitto and they are supposedly as good as 888's
http://www.nittotire.com/race-tires/nt01-dot-compliant-competition-road-course-tire/
http://www.nittotire.com/race-tires/nt01-dot-compliant-competition-road-course-tire/