That is exactly my path. I am using a generic Belden cable from my router. Before I got the optical module, I experimented with the JCAT LAN isolator and adding multiple generic d-link bridges and it seemed the more bridges, the cleaner the sound was. The optical module eliminated the need for all of those devices. I was using the EtherRegen strictly from the "A" ports. I found that "crossing the moat" actually reduced the dynamics and flattened the sound a bit, but oddly, just using the "A" ports still cleaned up the sound. Not sure if the EtherRegen is still providing any additional benefit now, but it does have a fiber port!
The best sounding ethernet cable in my system was the Shunyata Omega, but I could not justify the price difference for the 10% refinement. Also note that I have Sonus Faber Cremona M speakers, so any decisions I make should be in the context of the Sonus Faber/Pass Labs combination. I can imagine if you have Magico/Soulution, you may have different results. The Sablon is killer for the price. I also tried their Prince power chord and really liked that as well.
