I Have an 09 g37s coupe and I want new wheels but don't know if I should stay with 19in wheels like the stock size and width or if I can go a little wider in the front or back without rubbing etc ? And should I go with coilovers or springs

 

Need more info such as budget and what wheel style do you like such as concave, 5 -spoke, a cheaper cast wheel or lightweight forged, etc.

Ideally coilovers w/ full camber/toe kits, and forged wheels FTW, but that will come at a price.

 

] I actually like these wheels

 

How about these advan rsd

 

Again, what budget can you afford for the wheels/tires/suspension?
Those Advans are nice.