From Harvey Comics, I would have liked to have seen Captain Freedom, Black Cat, Shock Gibson, The Human Meteor, War Nurse, Red Blazer (the one from All-New Comics), The Wasp and The Red Demon team-up on a regular basis.
From MLJ, for a team I'ld pick Mr Justice, The Fox, Inferno, Firefly, Scarlet Avenger, Captain Flag, The Web and Black Jack.
For Quality I'ld go with The Ray, The Clock, Quicksilver, The Human Bomb, Phantom Lady, Alias The Spider, G-2 and The Jester.
From Centaur I would pick The Shark, Sparkler, The Owl, The Eternal Man, TNT, The Voice, The Marksman and Black Panther.