The MS600 will be great to your SSP-800 and net you much better streamed audio sound. I still feel I have to say that upgrading your pre/pro to 861v6 with built-in ID40 will be worth it.

I made the journey recently G68+MC200 -> G61R SL + MC200-> 861v6 + ID40. And you know what we say often "bits are bits" etc but I was not prepared for the upgrade in sound quality even though I know I'm listening to the same bits as before. smile

Going to 861v6/ID40 felt like the amps in my active speakers were upgraded to twice the power/control. As well as much denser and finer soundstage. Really amazing!

DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.