If I were to pick one as the best 100-page collection of Golden Age material, it would be
SUPERMAN 252
With a 1942 two-part "Powerstone" story with a bald villain character that was a prototype for Lex Luthor. Plus TWO Lou Fine stories, one The Ray story, one a Black Condor Story, a Howard Sherman Dr Fate story, a Jack Burnley Starman story, a Bernard Baily Spectre story, a Sheldon Moldoff golden age Hawkman story, and the only 1960's piece, an Al Plastino Superman story.
That's pretty much a greatest hits sampling of all the great Golden Age DC characters.
