Savage Hulk (who isn't even on this list,) owns the strength department. He's up there with the Pre-crisis guys, and has greater feats of strength than all of them. Savage Hulk has done some ridiculously powerful stuff in his day.
Savage Hulk has:
Punched through time.
Destroyed a universe by deflecting an energy attack with his thunderclap.
In one fight, caused shockwaves that affected the entire multiverse.
Overcome the matter-antimatter attraction, an infinite force.
Need I go on?
Savage Hulk is the strongest one there is, period. Only the fully powered Spectre would be stronger, because he is essentially God.