I have driven a 350 on 19s, OEM 18s, Rays 18s and JDM 17s. I have to say my preferred option (ignoring looks) would be the 17s but then my preference has always been for more compliant/skinny predictability of what is going on underneath as opposed to the "I'm a mega hero - oh no - whoops I'm dead" variety. I have only had 050As or Kumho winter tyres on the Z so nothing to compare with. My comments relate to on road not on track - having said that I would still go 17s if I could get light ones and R888s.