The ZII in stock sizes feel awesome and I would go that route in your shoes. For me they lasted about 12 track days and ~2500 miles.
I heard the RS3 handled the heat better and I wanted to stuff more tire on the stock Rays so for my current set I went with the RS3 in 275f/305r. This combination is faster around the track but the car doesn't feel as sharp. I suspect that is a combination of the softer side walls and the wider tires but since it is faster I'll stick with it until I go to a square 18" setup.
ZII when new