I'd say $1500 tops. What kind of shape is the paint in? Interior? Tires? A lot of things factor into the price, but if everything is clean then I'd go with that.
Keeping in mind that you will likely be replacing all the bushings on the car at this point. Just because something is low mileage doesn't mean that they don't deteriorate over time. Along with brake fluid, trans. fluid/filter. Does it puff blue smoke when started or when you first accelerate from a stop?
These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.