I don't know of any sites in AU, but you'd definately want at least 17x8 +32 on the front, and 17x9 +32 (+35 or so) on the rear. Officially in Japan at least, 9" onthe rear of R32 GTS-ts are too big, they quote 8.5" as being the maximum width... but we all know 9" go on the back with correct offset somewhere around +35.
Btw, try and go for a Japanese brand if you can, most wheels made in AU are either to narrow or the offsets are too high ie: for FWD.