i would look seriously look at Vans, RV's there are plenty flying, 1000's! and built by people from all walks of life, that to me says a lot about the ease of building a vans.. you can start with a rudder and stabiliser kit only, and buy the next kit as you go. or buy a complete kit, or quick build. or wings kit, fuselage kit. etc.
plenty of unstarted kits around o the US second hand markets.
The Savannah is another with a large completed fleet. i am not sure you can buy separate kits for the Savvy though.
another i like is the Sonex, again, nice looking aircraft, plenty of model options, and i have seen quite a few around, again, suggesting ease of build and support available.
i am a little biased, the next edition to the hangar will be an RV7A to keep the Savannah company.