So, the prebuy doesn't scare us, many of these planes have damage history. But the radio stack is unsupportable (check this). And the price is too high.
As someone else said, make him an offer of sig. less than asking price, and back it up with the avionics and damage history. See if he takes it (mine did).
Also, have you had a disinterested party look over the plane? I am constantly amazed at all the hangar rash and paint scrapes I never saw when I had my rose-colored glasses on while I wrote the deposit check.
You *WILL* spend money fixing things, making it your plane, the first year. Factor some of that in, as well as the unknowns. My first year my partner & I dropped 6K into the plane fixing things, adding things, etc. Be prepared...and best of luck!
