Contour Enthusiasts Group Archives Forums Modifications Wheels & Tires 17's or 18's?

Im thinking about getting new wheels/tires. But what size to go with? Im planning to lower the car, but having a hard time deciding on wheel size. The money isnt the issue, its just if I go with 17's, will I regret not going with 18's?? And if I go with 18's how hard is the ride gonna be?

Thanks guys/gals