well personally I think selling cars is a bit like selling a house... u let as many ppl know as possible and hopefully u find the right person.. for example... dad sold his house for $800,000... no one wanted it cos it is a horse property and out of most ppls price range. 12 months after it sold - the owners ran into trouble and sold it.. for 1.4 million.. all it was is luck that the right person came along..
now back to the point.. advertise your car everywhere.. print out flyers and post on local boards in shopping centres, uni's etc...
post it on as many forums as possible... fast fours forum is one that you could try (forums.fastfours.com.au).
Basically, the more ppl that u reach, the more likely you will find yourself a buyer.. also, FOR SALE sticker on window can help etc.
Also, depending where you work, you might have access to large email lists / fax lists.. always a good idea as u never know who might read it..
hmm.. hopefully all above isnt too much bull**** and makes sense