You may want to consider a 255/35R18 front and a 285/30R18 rear with a the addition of a rear swaybar. This way it would be much easier to sell the wheels/tires if you decided to and the you would also be able to use them on a TT if you bought one in the future. It would give you a very aggresive look, while maintaining the handling balance. You can go to the link below for the offset information, but the 41mm offset fornt and 45mm offset rear will work fine.
Wheel/Tire fitment guide
Later, Steve
Wheel/Tire fitment guide
Later, Steve