Hey mate - welcome.
Stick with what you have for now, perform the usual breathing mods, perhaps a computer (money permitting), a decent tune and your GTS will be plenty quick, especially if its your first real taste at a performance car. If its a manual, still think they quote about 0-100ks in just under 8 secs out of the factory, so some small mods would easily see it quicker than your 'SV6, XR6, VRX' brigade.
Good luck anyway!