Originally Posted by ducktailjiver
The length is not the factor dude, the quality of the cable is. Glass is simply better than plastic when it comes to fiber optic.
While your statement is true, when working with the distances typically involved in home theatre audio (in your case 50 feet) the "conductor" material choice is a bit trivial. At 50 feet a decent quality PoF will yield the same audible and measurable results as a GoF for orders of magnitude less in price. So long as the PoF is undamaged and of reasonable quality, your 1's and 0's will reach their destination unmolested.
I speak from experience. I have Monoprice Toslink cables in my installation; one run of 65 feet and another of 35 feet and both perform as well as "premium" shorter length cables.
If you simply have a desire to spend money frivolously, then by all means go with GoF, but I would not expect to hear anything differently except the echo from the void in your wallet...