One way to determine value is to see how much you can finance it for. Finance companies determine value based on engine time, the higher the time, the less they'll finance for. Even if you don't finance, check with AOPA or one of the other outfits and hear what they have to say. Also, you do not have to do a major at TBO. Many planes are flying long past TBO. I'd want to do an oil analysis first, and then if compression is good, check the books for when mags were overhauled, and what kind, starter, etc. These can run a lot to fix. If OK, just fly it. However,given your high time realize the market is not strong, so make a low ball offer. The radios, etc., don't count for much if the engine time his high