Hi OkieFlyer.
I would chime in at about $35,000. Definitely have a mechanic look it over though. It has flown more than a lot of the airplanes on our field. There is no magic number on yearly hours. An airplane flown an hour every weekend would only accumulate 52 hours a year, and an hour a weekend would be plenty enough to keep the engine in good shape.
Heck, two or three tows to altitude a month would be sufficient to keep the engine properly excersized and lubricated.