Tricky to know how to pair two components - and which interconnect is best. I would go for a Marantz CD6005 or 6006. You can talk til you're blue in the face about DAC chips. At this level you'll not really find two DACs that sound very different ihmo. Buy the Marantz and you may even have enough money left to buy a Chord interconnect (for example) - it'll be more bang for your buck than a DAC upgrade.