What's a good CD player, £300 - £600, with a bright, open sound, detailed mid-range and plenty of bass grip, where you can hear the snare-drum spit, the guitar-strings ring and the sound doesn't get cluttered and 'mushy' when the sound-stage starts to fill up. At the moment I have a NAD 515BEE. It's great for quiet songs but tends to 'condense' the sound when the going gets busy. What would be a meaningful upgrade?