@scottfromboston nailed it. You don't want a complex airplane if your goal is training and time building. Again, you don't even need it for commercial/CFI any more.
So, find an airplane that is simple and forgiving and easy to sell, and fly the hell out of it.
Also, avoid the "deals" where the airplane has been sitting. If you're looking at a Turbo Arrow that's been sitting for $40,000 vs. a normally aspirated Arrow that's been flying for $50,000, just remember that the "cheap" one can easily have another $40,000 or more in maintenance bills awaiting you in the short term, and after you fix it all up you've spent $80,000 on a $40,000 airplane.