I am trying to justifty if its worth it to pay for the GFX package because I might want the black tail light on the GT sedan. The GFX comes with the moonroof which I could live with and wouldn't mind having. But is getting the 17' a such a good idea? Because the ride will be much rougher (according to what I've read so far) and when its time for tire replacement it will cost quite a bit more. Plus there are not as many to choose from right?