Nice clean car,the grey one.
My suggestion donot go for the golden Rims, they have a tendency to rice up the looks, and IMHO they feel like some one in golden shoes or some one with yellow teeth.
If you go for grey rims they would look much better in your car.
As for the RIM size dont increase it just cuz you want to increase it, get help from the thread " iam tyre guru"
I think you should not go for Rims greater than 15. as it would greatly increase the load on your car engine