I think the RV8 is a good pick for this moment in time, but it does not fit the foreseeable future. Airfields will neither be affordable nor will there be adequate or affordable hanger space as metropolitan areas close airfields and fail to build replacements. There's also the reality that airport crime is soon going to a be popular vocation. If I were going to write the spec, it would be a trailerable tri-gear, high-wing two-seater with a center stick and touch-screen instruments on both sides of the panel which operated on redundant electronics. it would have an autopilot that used drone technology - with a "go to home/nearest airfield" button and a panic button which would stabilize the aircraft into a two minute turn, clear of obstacles, to allow the pilot to recompose and assess an overwhelming situation. Until engine makers reconfigure their products to run on unleaded fuel, Rotax would be the engine that the airframe would be designed around. That would eliminate the RV and similar performers for the moment. I also believe that the common man's airplane would have an available "assist" function in the controls that fed inputs into the pedals and stick to coach the pilot's control reactions with a small amount of force, while allowing him or her to smoothly override those suggestions. "Assist" could be switched off at any time, but it might be prudent to tie it into the autopilot in a way that would engage the function anytime the aircraft entered the yellow zone. Inspiring looks, priced somewhere around 100K, safe and easy to fly, and parked in the garage when it's not flying regularly.