There is another big reason that hasn't been mentioned yet. With digital processors, such as digital EQ and upsampling, or processors built into to surround processors (such as room correction and surround processing), you're better off keeping the signal in the digital domain without introducing multiple DA & AD conversions. You can use the digital out of a CD Player, but why use that if the CD player's DACS will never be used? My preference is to use a high quality transport routed to a Digital EQ processor, then a DAC, then on to the preamp.
