Hi i have a 2005 g35x and i need help deciding rims should i get 18",19"or 20"?

i want the rims to be chrome because i have a graphite g35x with chrome pillars i don't want the car to look like a 4X4 so thats why i need help deciding i also want to stay away from using shocks to lower the car because it seems expensive and alot of work last i would want the car to still handle like it does with stock tires and rims thanks