Terbo, depending on where you are that is.
In Australia that is a good price if in the US it would be average.
I have 3 big bore Honda's a 84 500 in used but good condition thatt would be worth 6K, A very good rebuilt 83 480 that sits in my office that would go for around 7K and a 10 hour since rebuild 82 480 that would go for around 6K.
The 82 is the least sort after but are still a good bike. Mine has DG pipe and SM Pro rims with stainless spokes, white powder coated frame and re-zinc plated everything, so that adds a little to the cost.
82 are a lot more common that the 83 (talking 480's).
They are a great bike to ride and sound great. I can not ride it as fast as I can a 250 but there is something about a good 500 that keeps you coming back.
Sounds like a bargin if you are only going to spend 2 or so K on it.
Shane