it really depends on the color of the car. If you have a candy color, bright finish car, then polished or chrome is ok. I hate to say it but chrome is a lil too bright and shiny if you ask me. Usually with a nice japanese car such as our SC's, JDM brand rims are a better choice. 19"s are perfect. 20"s are pushing it but still ok. I have been competing and judging car shows for years, all i can say from a veteran's and judge's standpoint is that the bodykit, paint, and rims amongst other exterior pieces must all flow together well. Anything that looks out of place will lower your points for overall display. just some tips.
BUT rims are always a touch of personal taste of the owner. TO EACH THEIR OWN.