I have had my car for 8 months now and am beginning to think that the 16's on it are too small. I really dont' wanna spend much cash on bits for my car, but am tempted to either get coilovers and lower it a smidge and/or get some 17's for it.
I would definitely say that 15's would look pants. The deep rear wing and the distance from bottom of rear window to wheel arch makes bigger wheels balance the look of the car better (IMO).