It depends on the condition, what work has been done to it in the form of upgrades and what someone is willing to pay.
Storm is a P platers dream in NSW and many have been flogged within an inch of their lives so my gut feel is that they would sell for somewhere between 2 and 10K. Having said that a quick search found a couple advertised for around 15K. I expect they have been sitting at that value for a while.
Car's guide has them valued at $4.4 - 7.15K (follow the link
here) so it really depends on what you think it is worth based on your research and its condition and history. Then it is a matter of finding someone who accepts your value proposition.
Jump on gumtree and ebay to see what people are advertising them for and make a note of how long they have been on the market. That should give you a reasonable indication.
Cheers n Beers
Jolls