Look at CenterLine RPM's 17 X 7 weighs in at 13.5# each. These are 1 piece forged wheels. You can't really go smaller than the stock 16's that are on the car, because of the brakes. The best price I've gotten so far has been $275.00/each at discounttire. They aren't a stock item but they will order and I was told 2-3 weeks. The bolt pattern for the RSX is 5 on 114.3mm and the offset is 38mm.
www.centerlinewheels.com
BTW I drive an Arctic Blue TypeS. 23000+ miles since 07JUL2001