Sup man where abouts in Oz you from.. I imported my gt4 from japan this year, and in total it cost me 8850 car, shipping, FOB everything. then I got it repainted and yad yad yad.. it's up to you really, As Beej said you can get cars for that price here, or you could buy imported JDM version, which has slightly different things like climate control and a tiny bit more power as it's JDM version. You would also be getting a Narrow body gt4 like myself, if you do some research into it, Gt4 are mainly wide body, flared over the guards and so forth.
So it all really depends on what you want.. I imported mine cause it had all the fruit, like ABS, and SUNROOF, and climate control, and low Km's and so forth, so really mate its up to you, but if you want it and can get it checked out then do so.
WhenI got mine I had to change everyting really, radiator needed new end tanks, new carpet, new Dash board (as you will need) new paint job, new timing belt, waterpump, batt, tyres, exhaust...
So you really have to way it all up.. you can check out my car.. start to finish pics at