You are probably right about the cost of the tires and wheels. Most of the ones I have seen are about that or higher.
You probably already know this, but Tire Rack (
www.tirerack.com)is a great site to shop or just to tinker around with. The site will show a pix of your car in the corect color and you can select from a wide choice of wheels which it actually shows on the car.
Good Luck!