I've read that the jitter issue with toslink is the same as that with the coax, in that the S/PDIF interface itself uses its own clock signal, separate from the clock signal coming off of the source, causing some "confusion". The result, from what I've gathered, is less apparent than the tic-tic sounds caused by jitter from a d/a. However, if you read this article by Bob Katz, it says that almost all jitter is subtle at best.

Flying in the face of audio idolatry, I suggest buying a relatively cheap, well-shielded coax cable, since they're overall cheaper than the optical. Radio Shack is usually fine, so is making your own from RG59, although if name brands appeal, you can find many used audiophile RCA video cables on ebay very cheap.