Off the top of my head in no particular order the guys who IMO would go if they quit today....

Oscar De la Hoya,,Bernard Hopkins,,,Gatti,,,Mosley,,,Castillo,,,Jones,,,Tone y,,Barerra,,Morales,,Wright,,Larios,,Sanchez,,Byrd ,,Virgil Hill,,,Arce..to name a few all have had several or a seccussful reign and proved their worht to the sport