fiber optic/toslink cable recommendation

hi all, i really dont know anything about these types of cables. i have quite high end power cables, interconnects and speaker wires, but i am running my movies from an external hard drive into my cal audio cl-2500 processor with a cheap monoprice fiber optic/toslink cable.

i see some glass/quarts fiber optic/toslink cables but i dont know what to get. i know that i cant always just go buy the price of a cable.

any recommendations for a cable?

thanks