agreed (as usual lol), you won't be able to modify a gts to be quicker than say a commodore from the lights. the stock car will be really nice and you may as well save and buy/make a monster when off your p's.
either buy an r33 rb25de gts or something else (mr2, mx5, mx6, sss pulsar, awd v6 magna, supra, 2 seat manual z32, good civic, celica, and a host of others), something that'll do you till you can buy something really fun. just my thoughts anyways