Re USB, in my opinion, as long as it is shielded, it should be fine. There is a guy on Audiogon selling "Silver" USB for $50. It is shielded. Also you can add ferrite cores at the end to remove high frequency noise. If you are DIY guy, the USB cable is very simple, with 4 wires. Braiding does not work for USB. I found a braided USB with Ferrite core at the end to use - about $30. If DAC's would have buffering like in the Mark Levinson DAC, that would be the best! Otherwise Asynchronous USB to SPDIF/Toslink will be very helpful (M2tech $150).
A reasonable company for Glass Fiber will also work. I am not sure a $1 glass fiber has the quality and the other extreme of $200+ in my opinion is too much. Siltechs are always good but margins on cables are 80% and up, so you pay a lot for the name. I had Audioquest for $100 and went to the Amphenol Ultra Premium Optical Glass TOSLINK at 16 ft so I could put the computer in the closet. This is longest Toslink specs allows. Having the computer in the closet removes the physical noise and perhaps electrical noise - I use another outlet with a filter.