Mo, I've not been onsite here for a few weeks and missed your question :/
I did a vast amount of research around this topic about a month back when I got a new amp with fibre inputs. The conclusion I drew was based on a lot of good content from a few sites. I've started a couple of pages on my personal website below, specifically based around SPDIF (digitial audio interconnect), conversions and their interaction with cables.
I basically drew the conculsion that 'cheap' cables (most of them) use the same cable (2mm PPM) with a range of ends. The higher the price, the better the ends and their finishes typically. I haven't bothered chasing down true glass fibred cables as SPDIF doesn't require the bandwidth that it offers. Decent cheap cables will do that happily.
At this stage the page is a little sparce but it does at least have a good selection of links you can jump to fully explain cable types available and the finer details of the conversion from TTL to both light (Fibre optic) and/or current (75Ohm Coax).
Head on over to the /doodads site and look under Home Stereo menu.
CfP
