I run PSSs on the street only. I think RS3s are the best bang for your buck tire. Can't see running a premium street tire on the track. Just run Michelin Cups.
Current: SBM X5d, Jet Black E46 M3, Black FJ Cruiser, 1970 240Z
Former: '11 MCB E90 M3, 2011 Lotus Exige, 2003 350Z, 2002 WRX, 1996 Supra turbo, 1984 320i, 1987 E28 M5