high quality vs normal cables
I was always under the assumption that the higher quality cables cost more for three reasons; gold connectors (obviously for better connectivity), insulation (for less noise, and longer distances), and name recognition (no advantage). If it's the case where the cable is the bottle neck for the PQ or SQ in your product then spring for the better ones... otherwise who cares. I guess the only way to know is to try it and see for your self... unless there is a guide for distance etc out there?
Also... it seems to me that it makes more sense to have a high quality cable when the signal is analoge... not so much for a digital signal (unless its optical).