Matt,
I've auditioned the Synergistic Research Tesla D2 coaxial digital cable and was impressed. Some say the D3 is even better. Link here:
Synergistic Tesla Digital CablesAlso, please note that the DSD-S (as many other DACs) has RCA type connectors for the digital S/PDIF inputs using the WBT NextGen that are 75 Ohms too. This was chosen after experimenting with various BNC connectors. So maybe it will be better to get a BNC to RCA cable that will give you a better flexibility.
Looks like the Cable Company has a Tesla D2 with BNC to RCA.
Link here (scroll to the bottom - Digital Cables):
Tesla D2 BNC to RCA digital cableBest,
Alex Peychev
APL Hi-Fi