Hi,
Ummmmm, if ur still looking for sites to put your car in, try carsales.com.au, drive.com.au and carpoint.com.au
I'm pretty sure that it only cost $10 to put it in each site and this includes 5 photos that you can change all the time to keep your cars look updated, lots of character space and pretty much a good exposure.
Also if you take a look at any of this sites you maybe able to get an idea on how much you should be selling your car. eg there is a 95 skyline in carsales with 95,000km going for $15,500 negotiable.
hope that helps