Stick with what you have. 4.1-x is a great player, however, you are going to see diminishing returns and pay a hefty price margin. Wait until you can get your hands on a good used Naim CD 555. They are rare but do appear once in a while. They are selling used for about the same price as a 4.1-x. That player goes way beyond the 4.1-x and sounds even better than the Metronome $55,000 set up. I heard them side by side. I am not a big Naim fan but that player took the redbook CD to levels nobody has ever achieved.