What does 'mint' mean? Original low mileage never restored? Or perfectly rebuilt/refinished like-new restoration?
If it's cosmetically and mechanically perfect, $2000 wouldn't be unreasonable. I bought a '76 CB550F for $350 and will break $1,700 in total costs in the next two weeks - of that only $500 is labour from my mechanic. The other $1,200 is new parts and boring the cylinders for new pistons/rings.
The advantage I have is I know exactly what is on/in my bike. Any bike can be made to look nice. Make sure everything is as it should be - compression check, hear it run cold and hot - any idle loping? If it is mint and working perfectly, like I say, $2000 isn't a bad deal (in my books).
If you can get it for less and it's perfect, and you LOVE it (don't settle if you had your heart set on a 500 or a different model for example) then buy it.
Let's see pics!