the new nittos are great from what i've heard. if you're looking for a tire for a car that sees mostly street duty, and light track duty, nittos are the way to go. my 555r's are just about bald, and they still dead hook in second when warm. they will incinerate in first gear, but hook good in second from a 40 roll. i was able to cut 1.75 60' times at the track and i'm a novice. when cold, they will spin at 80mph though. i've had them on my car for 3 years (roughly 7,000 miles)---bfg's and mt's/etc won't last nearly that long. my cobra makes roughly 590 to the wheels, with 575rwtq, and the tires are 315's
i also have 555r's on my GTO, and will drive them in the rain sometimes--these are the 275's. my GTO makes 375rwhp and the 275's hook very well.
i'm going to put the new track nittos on my cobra and my vette this summer