I wouldn't mind seeing the old Archie super heroes like The Fly, the Jaguar, the Hangman, the Web, and the rest. But not the cruddy "modern reimaginings" people keep trotting out with the mistaken impression that "mature" equals "graphic depiction of dismemberment and murder." I want a sourcebook faithful to the originals, as gritty as they were in the 40s and as corny as they were in the 50s.
Tower Comics' old T.H.U.N.D.E.R. Agents (NoMan, Dynamo, Lightning, Menthor, and Raven) and U.N.D.E.R.S.E.A. Agent material would be fun as well if kept true to Wally Wood's clever originals.