May I comment on other things to do with the original suggested system?
The DCS dac systems to me, look like a car with an engine at each wheel, rather than one efficient engine driving two or four wheels via a very carefully opimised transmission. Each engine will need careful throttle and so on adjustment independently as well as equally to maintain the same loading on the wheels (excuse my bad wording here). The thing is, it's been shown that one well designed engine is all you need to drive a four or more wheeled vehicle along, the fun being in optimising the engine to the chassis as a whole for the task at hand. The RME dac does it all really for domestic use, but I suspect it doesn't look the part for some.
I worry about the long term reliability and service of the apparently hot running D'Agostino amps. Early Krells, especially from the KSA80 era non-fan-cooled models onwards, seem to all need substantial servicing now as the hot running chassis' have cooked all the electrolytic caps as well as the circuit boards possibly. Even the plateau-bias KSA50S I owned for a while, suffered what I regard as severe discolouration on the circuit boards where the design called for four transistors in a bank (current amplifiers?) to be biased hard I suspect, hot running (even if the output stage could idle at low temperature). There were four sets of these in this differential circuit design. Anyway, what I'm saying is that the think could cook if run in a spirited fashion, something like twenty elexctrolytics per side which I felt beyond me to strip out if necessary, so I sold it to a chap who enjoyed it for a year until a 'bake-off' in a local village hall where I suspect it was wrung out. It was never the same again, one channel started to distort and an engineer pal who tried to repair it admitted defeat! The Hypex/Purifi based amp designs also look to have a lot of electrolytic caps on the board, but they seeming run cool most of the time, so a long life should be taken as read hopefully. Shame he's not here now, but the March Audio amps do look nicely finished and presented as an example, if that kind of thing matters.
Now, maybe the OP's disposable income can take the ott DSC and hot running steam punk D'Agostino amp in their stride and for that kind of person, brilliant! A shame that many such purchasers wouldn't even look at simpler and at least as good alternatives - I can't speak for the speakers as final choices will be more personal. I'd ask if he can try to get a listen to the domestic/pro-crossover speakers like the D&D and Kii to name but two (I suspect the larger Genelecs and so on are extremely naughty in the current world, as large active ATC's and JBL's used to be in my day
).