So many great suggestions here, truly amazing builds. Just want to throw out there that if you find something that has potential, but maybe isn't finished to your liking, there's always the option to refinish.
I had this 1986 Miyata 912 frameset powder coated by Groody Bros., and am very pleased with the results. Built up with a Campy 3x9 group sourced from a member here, Fulcrum wheelset from Merlin, and it is a fantastic bike. Link:
https://www.bikeforums.net/21834316-post7878.html
Check out the Retro Roadies thread for tons of inspiration.