Right. I forgot that you strictly have a digital system so messing around with the signal in the digital domain is fine with you. People who own analog sources in addition to their digital source(s) aren't automatically fired up about converting their analog signal to digital and then back to analog again.
There are more and more systems with A/D and then RIAA eq in the digital domain. TAS had an article with PS Audio A/D, although some could argue that is not high end. Then there is Channel D Seta. If you really want to go high end, pick up a Emm labs or other pro A/D.
From what I have heard at 192/24 you would have to have a really good system and room (well treated room) to hear the difference. But that is IMHO.
On another note, the DEQX was tried against the Hilo Lynx.
The DEQX was very nice to use, integrated with everything and the kitchen sink. It would eq just the speakers, the it would eq the room. The DEQX support guys could even dial in and do the measurement and setting for you. Very slick.
The only thing going for the Lynx Hilo was the sonic quality and it had 4 channels out. The A/D was a bonus. The room eq was done with a Behringer and compared to the DEQX.
The final result was the eq'ing the mids and highs was not pleasant. It had a artificial sound, even plastic if you can call it that. This is consistent with many on the eq front. We eq'ed just the bass from 250 Hz down. There were slight adjustments on the top end but only shelving filters with 1 or 2 db adjustment over an octave or more.
With both the eq devices, the bass eq made everything "good". We took the bass peaks out and pushed up bass suckouts and valleys a 3-5 db.
The slow curves adjustment on the top end help balance the top end without any harsh effects. For some this was more a "preference" and for the technical, this was more correct. I would imagine in a room without treatments, it would be easy to drop the top end to reduce the brightness. However I think room treatments are much better sounding.
The point I was trying to make here was that the Lynx Hilo and a Behringer got the job done and I preferred the sonics of the Lynx Hilo. Perhaps you could give it a try also.