I'm not willing to spend much, (at least in audiophile standards) that said I just recently bought the Veritas Aperta SE speaker cables. I am very impressed with them, and Veritas has there Nexum C digital S/PDIF cable at $299 for 1.5m. I am thinking of trying it to compare to my optical cable. With a 30-day money back trial period, takes the gamble of the equation.
Thank you for the technical explanation, that makes sense. I like to think my system (Simaudio Moon 600i integrated amp into Focal L&R Utopia Be loudspeakers) is a rather resolving system.