Given the apparent upgrades, and especially with the trailer, the price seems about on track. Of course, typically you would expect to get the boat for something less.
That vintage will have a solid glass hull, no coring except in the deck areas, so that worry will be gone. She looks well kept, but of course the survey will be key in making sure she's not just prettied up for sale.
Given the relatively recent sail inventory, I think you may not need to budget a great deal for immediate upgrades (pending survey, of course)