I need help on wether to upgrade to a better cd player or stick with the one I have which is a Marantz CD 5003. My system includes a restored Marantz 2252B receiver...restored Marantz 6300 turntable...and Energy C-5 floorstanding speakers. I like my vintage gear. I read that you need a premium transport....up to 192khz DAC and beyond.....seperated regulated power supplies......cd-r and cd-rw compatibility...and with coaxial digital output. I don't want to spend a ton of money on a player if the sound difference is so minute that only a dog can hear the difference. With so many out there I don't know where to begin with Parasound....NAD...Cambridge Audio...Marantz...Oppo....Rega....and Vincent. Terry