I think that speakers like the DM602s are only avarage units. At this level all the recievers you mentioned will go well. If you're more for movies maybe Yamaha. If more for music Marantz. But if you care for the music, the DM602s are not enough. The SR5400 is a "different unit" if you hook up a pair of 703s. And the same SR5400 maybe again "another unit" if you drive a pair of N804s.