I'm using two reasonably-priced Grave Science SPDIF cables in my system (around $AUD95 each) and they do the job just fine. The Grave Science are comparable with the Black Cat Veloce SPDIF cables in terms of performance, so the bang for buck is quite high.
I do have some ebay-special, $10 jobbies lying around which I might fit between the SBT and Synchro Mesh (once it arrives) to see if there is any percievable difference between different cables when used pre-reclocker.
Sadly I never thought of trying this whilst I still owned the audio-gd unit.
••• Logitech Squeezebox Touch > audio-gd NFB3(2014) w/ E9018 > fully recapped/restored Sansui AU-X701 and AU-719 > a healthy sprinkling of expectation bias > PMC GB1i speakers > Aurealis and Audio Principe cables •••