It'll look great with 18" wheels. I prefer smaller wheels and more rubber anyway. I dropped from 20" to 17" wheels on my 07 (essentially same body style).
I say go for it. To run anything wider than a 285 you will need offset wheels.
with a level kit and around a 0 to a negative offset wheel you can run up to a 35x12.5x18 tire
JVC Arsenal KD, Bilstein 5100 adjustables [maxed], aFe Stage 2 Air Intake, Superchips 3865, Husky Floor Mats, Saddleman Camo Seat Covers, Flowmaster 40 Series Muffler SI/DO, 20 % Tint. 35x12.5x17 Federal Couragia M/T, 17x8.5 VTEC Warlord wheels, -12mm offest.