the sssnake MTS 164 - 50

Good, clean noiseless cable (and I've highlighted the pro/cons of the stagebox in a review on its page), and reasonably flexible for a typically thick cable.

Durability also seems to be good, with solid connections at each end.

The only con with installing: if installing through walls, roof or other structure, the width of the connections at each end require a sizeable hole put into each wall/roof, which isn't always ideal.

Otherwise, surprisingly good quality audio, solid construction, if a touch awkward at each end.