The Lampizator Baltic 3 synergizes well w/ my Innuos ZENith mk3. NO DDC, direct w/ a Callisto USB. I have tried 2 DDC's in line and it sounded better without. This is not true of other USB cables on this combo though. That may put you over your $7k budget. Also the Innuos Sense 2.0 software was more to my preference over ROON 1.8 build by just enough so that I switched over.
Good luck w/ whatever you choose. This combo works for me.