I haven't travelled as far down the rabbit hole as you but I have had a sip of the Kool Aid. That is to say that I, as you know, have HFC cables in my system though I haven't gone as far up the food chain as you. My cables, in terms of expense, range from a CT-1 power cable to a CT-1 Ultimate Reference power cable. I am enormously happy with the HFC line and I expect that another CT-1 power cable for Blu2 will complete my financial investment.
Regarding a source, I have the SoTM 200ultra powered by the sps500 power supply, next connected to an Iso Regen followed by a Phasure Lush usb cable which I then connect to Blu2. I also have 8 Farnell Ferrite Cores on order to use with a pair of 2 meter 75ohm BNC cables(same supplier as Triode User). A Paul Hynes SR7 would be nice except that I have recently entered end game status, know by most people as "retired."
Incidentally, I have LH Labs' TOTL usb cables plus the Phasure Clairixa cable on hand so I haven't entirely settled on the Lush as of yet.
With the SoTM line I have made a decision to stop short of purchasing the txUltrausb and I have also decided against investing in a Mutec clock, however tempting. I expect that adding both would make for that much more of an extraordinary listening experience but, well, (for me at least) it has to end somewhere..
As you (Roy) also know, I have an HFC Trinity Helix as well that I use with an HE1000 V2. For cabling I've settled on the Danacables Lazuli Reference which I prefer to my (much shorter) DHC Prion4 cable, soon to be put up for sale.
I could live happily with this setup for the rest of my days(which would make my wife and our retirement investments extremely happy). To be totally honest, I would jump at the chance to pick up a pair of Devore speakers and the (future) Chord digital amp but, given how indulgent my wife has been thus far I really don't want to push it any further.
My next chapter in the adventures of BluDave will be comparing DSD and PCM files of the same music(including same mix and master) to see how BluDave conversion to PCM compares with nonconverted files played through Dave alone on the DSD setting. I admittedly have a significant expectation bias here given Rob's preference for PCM but I'll make a serious effort to not have that cloud my judgment.