I use a High Fidelity CT-2 S/PDIF coax, I've also owned the Reveal digital. I can only speak to these cables, they're neutral and transparent. So much so that they don't influence the sonic signature of the music.
I tried recently to find some used HF ICs but had no luck. Go to the Audiogon archives and look for High Fidelity Cables, there are threads about their various products. You may need to skim through to find comments about ICs. I have several products, so glad I got them before the company folded.