Adding the XPS2 to the CDX2 will take your breath away. I think. IMO, the CDX2 was really made as a means to eventually upgrade to the XPS2 power supply in steps. The big PS adds so much tonal density and richness that the CDX2 becomes a different player. Personally, I would prefer a Naim CD5x with a flatcap power supply to a naked CDX2, but when you add that XPS, game over.