Suggestions for toslink cable?

I'm connecting my Sony cdp changer via toslink to an external Adcom dac. (Yes, I know that source arrangement is suspect and lacks audiophile class, but its the best I can do right now - I have a bar exam to pass and a law office to start up first - I'll get a 'proper' cdp when I have the $$.) The Sony only has a toslink digital out. Does anyone have any strong feelings on a proper cable? Seems there are quite a few of them out there ranging in price from $5 on ebay to over $100 in the stores. No sense in overkill, but I'd hate to ruin the addition of the external dac with a lousy cable. Thanks for your help.