The 600 is not that radically different than the 580. It sounds like you simply want a different sounding headphone. More bass than the 580? How about the Koss KSC-35? More resolution? Look into Grado, though I'm not sure if the Grado line would meet your bass requirements. Maybe the higher-end Beyers are what you're seeking?
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Russ 'The Peripatetic Audiophile'
"Necessita c'induce, e non diletto"
-- Dante Alighieri
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