Thanks Rob, I appreciate the recommendation!
RD, Kimber makes great stuff, but upocc copper is a huge advantage with Omega speakers. Since there is no crossover the speaker cable is the only thing between the amp and the speakers, and the difference in conductor quality is readily apparent. With some speakers... usually low efficiency speakers with a complicated and reactive crossover, your money might be better spent on something that uses heavier gauge and lower quality conductors like the Kimber you mentioned. But on Omega speakers, my cables will be a night and day difference vs the 8TC and you just don't need such a heavy gauge cable.
The speaker/amp relationship is much more variable from system to system than the environment interconnect cables operate in, so the best speaker cable for a system is going to vary more than most other cables. I design ZenWave cables using Omega speakers and I can guarantee they will be a great match.
As far as "getting into the upper echelon" in speaker cables, with Omega speakers it makes a massive difference. The higher end silver speaker cables I sell are not overkill for Omega speakers, they are resolving enough that there is a pretty huge difference in performance between the models of speaker cables I sell. There is no doubt in my mind that Omega speakers can be the basis for a world-class high-end audio system, but it won't happen unless the other parts of the system are also world-class.