Best bang for me was replacing the steering box to stop an annoying leak. Previous owner had dealer remove power steering pump three times to solve leak problem. Solution was in the steering box. And I did it myself!!!
Also replaced air injector pump so it would smog. And installed new blower motor and resistor group, Bilsteins all around, and new inside door handles.
But the most fun I had was winning a matching console box off Ebay. That was fierce!!