Would silver cables beat UP-OCC copper?

Looking at your system page,I would stay with copper...

If you get yourself some thick copper cables wrapped in a tough jacket, they can take a hell of a beating. Every bit as tough as silver.

You would do better with copper given your horn speakers and SS gear. If you can afford them look for Cardas "golden" somethings,for a nice mellow tone. This will start another argument I am sure. The OCC copper cables are very good as well. There are many many cable makers try to get an idea of what you want from cables. And Zd is right you shouldn't use cables to beat anything.

"Best" is and for the forseeable future will be a word with no universally agreed upon definition, especially in this opinion laden environment. That being said, silver can sound different, but silver can sound different than copper depending on awg size, configuration, solid versus stranded, shield vs. non shield, rca vs.XLR, type of XLR, type of RCA, resonance factors, capacitance, inductance, resistance, not to mention termination skill. To look just at silver vs copper is leaving too many variables off the table. PT

I have experience with both manufactured and self-made high purity silver and OCC copper cables. I agree with Grannyring's thoughts on tone and with Plasmatech's comments on the subjectivity of "best." My favorite speaker and IC cables are made from solid core OCC copper. For power cords, I have had good luck with fine stranded OCC wire, unshielded for amps and shielded for digital source components.