Why do anything? You have a great system. You can continue to spend more money upgrading one or more components in your system every six months. You will never achieve the end state because there is always something better (or newer) out there. Spend a few dollars on new music and don't worry about your equipment.
What to do next???
My system consists of a Marantz Sr-8000 reciever, Pioneer DV-05 DVD player (also used for CD playback), and MB Quart QL S 1030 speakers with DH Labs T-14 bi wired cables and BL-1 interconnects. I am on a reasonable budget and am wondering what the best course of action is for the next level of listening quality and enjoyment. A new dedicated CD player? I'm looking to spend about $500 bucks. By the way, should I use the DAC in the DV-05 or the Marantz? Opinions? Scott