I agree with Soarer. The GT-S is the ZR. Currently the difference with (2000 Spec and 2003) them is the nose cone and the RPM limiter has been moved a few 100s RPM to 8400RPM from 7600RPM. Few minor interior changes. The round tail lights and a few other tweaks to make it better.
(HID i believe is an option in America but Australia is still iffy)
If I have misinformed or missed anything please post...