If that boat is mechanically sound then that would be a steal. I've had my 1990 Sport Nautique for about four years now and it has been great. Me and my brother almost dropped some dough on a 2001 super air... but then we realized the sport nautique does everything we need it to do. It's probably the best direct drive wake out there (for the older boats). I usually run around 1200# of ballast and the wake is super big and firm. Do you have pics of the one you are looking at?
Here are some pics of mine... and a buddy of mine who also owns one. Mine is the blue one.