I am running 275/35-18s all around on widened 350z wheels, 18x9.5". I really like the R888s a lot. With upgraded sway bars and a square tire set up, the car is very neutrally balanced now.
They wear out a lot quicker than my michelin pilot sport cups I was running on the corvette before switching to the toyos, but I am also buying the toyos used as take off race scrubs for 100 a piece as opposed to 4-500 per tire for the michelins.