I would suggest you to keep the original stock rims but change your tires to 185 65 R15 Michelin or low noise Yokohama DB Decibel. It will cost around 12,000 approx. if you trade in your new stock tires i.e EuroStar 175 65 R15.
Don't go for 16' inch if you want to change the rims as well. It will surely affect the suspension and fuel economy.
Regarding color I think Polish Mett. and Taffeta White are better choices.
I have one in Polish Mett.