Glass v.s. Plastic Toslink

http://www.audioholics.com/education/cables/toslink-interconnect-history-basics

Here's an interesting read on the topic.

I use a Silflex glass toslink cable from Lifatec on my iMac to DAC. Highly recommended. A huge step up from the $25 plastic optical cable I had before. Well worth the few dollars extra.

Try here:
http://www.uniqueproductsonline.com/6ftgltodiauc.html
This is the place i bought mine, but they have changed a lot since i did over a year ago. So I cannot say they are the same product.

Here's the 1M Sonicwave glass Toslink cable on amazon for $25. There are a number of lengths available, search for 'Sonicwave glass' and they show up. You'll need a mini-Toslink to Toslink adapter but those are very inexpensive and can be found on amazon.com or monoprice.com by searching for mini Toslink adapter.

I use a glass cable I bought from a member on this site who used to offer them regularly. Haven't tried the Sonicwave but have seen it recommended several times.

I compared the Sys. Concept Inc. 1300 fiber plastic toslink to the Silfex glass toslink and the Sys. Concept Inc. cable was clearly better from my Apple TV music server.