Whats my '78 Nova worth?

I have an all mint, 1 owner, Never wrecked 78 Nova i am lookin to sell it has the 250 6cyl and is auto. What should I be looking to get for it?

Personally myself im not to fond of the new style box novas but depending on the color and interior color, I would start around 10 to 15 thousand.

That style isn't my favorite...but it is after all still a 'real' Nova. What type of power features, and accessories does it have? The engine it's self, if in top condition to a Nova nut would be quite a find, they never say never.