i am on Nitto NT05... its a great tire. they last quite long with regular street driving and they have good grip on the track. of course R comps are going to be stickier but you wont be able to drive them on a day-to-day basis.
Current: 2013 F10 M5 & 2013 GLK350
997.1 GT3RS (gone)
2009 WRX STI (gone)
e92 M3 (gone)