<<I don't really want to use an optical cable because the 25 feet that it traverses has a lot of turns and I am worried about the robustness of the cable. Also, a 25 foot optical cable is expensive.>>
It's not that expensive! It's a lot more robust than you think, too. I use opticals all the time for linking various bits of digital audio gear and I've accidentally subjected them to all kinds of abuse without a hiccup. Plus it's really small and neat. I'd go optical. Thing is with digital connections, if it works when you connect it up it's working. No half measures. Anything that affects sound will affect it big time.
Richard