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I've read a lot of guys are buying 2003 Z's with around 40k miles on them in the 20k-22k price range... I would say with 80k miles you looking around 17k
You just got to follow your area's price. You can't go online and say "so and so" got it for this price and I want it for that. Its the supply and demand in the your area that will cause the price fluxuation. Even if his price is not fair you can't make him sell it for a fair price. Just go on autotrader and look to see what something like that would go for.