[Pillow]

I like 16"s for everyday use.

17"s are doable but tire prices soar and the ride gets choppy due to the low profile tires.

18+" are show stuff that I do not think are long lived on a real driver.

Plus as a driver I like a little sidewall so I can "load" them in turns. With the ultra low profile it is hard to "feel" what the car is doing and how much grip you really have... It is too late when she starts to break traction as you are now in saving your ass mode which is bad.