With a budget of $80K, I'd get a 981 Boxster or Cayman, which was made from 2013 to 2016. It's the last series made with the flat six, and it appears that the depreciation curve has bottomed out for these cars. You should be able to find a good one for $45 - 55K.
Any 2009 or newer. No more IMS issues, debates, discussions, arguments, etc. We bought a 2009S, PDK, 25K ODO, Bilstein PSS9, IPD plenum. ECU flash for $27K in March/17. This thing is a rocket ship.