MX-6,
I too have read a lot of stuff out there, and my experience is my guide so I take the info that makes sense with my experience and skip the ever-present yeah-buts who think their "technical' "knowledge" overrules the experiences I (and many others) have had with cables.
I have heard the difference, often rather notably with all kinds of cables including interconnects, power, speaker and lately digital cables. Therefore, I Know that for me, in my system there can be very notable differences, some of which bringing a very comforting synergy to the musical presentation.
This may have to do with the very transparent and revealing system I have, and maybe part a trust in what I experience as real. But even for digital cables I have heard it and according to many this makes no sense. I can't say how BIG these differences are except for my self. Mostly with better cables, what seems to happen is the more clear, articulate and transparent transfer of energy from A to B. And this effects everything downstream.
It can be influenced by wire size, wire type, dielectric, configuration, shielding or other noise reduction schemes, connectors, solder...the lot. And with the good cables (the ones that help my system) the better transfer "reads" as improving all the stuff we want a system to reveal. Dynamics, clarity, bass-to-highs, musicality, "realness"....you know.
But to answer your question directly, I compared the cheaper Kimber to a "stock" USB cable and thought it was worth the 50 bucks or so, though not a huge difference. Then I stumbled onto Wireworld stuff and with the recommendation of Mike at Tweekgeek, tried the 90 dollar Starlight. Not much to lose with the return policy.
It really fleshed out my sound, better in every way than the Kimber, subtle, but sort of BIG too, it nudged the sound more into the clarified musical experience we have come to expect from Decware. So I kept it and am happy with it.
Long story short, if you are like me and want good sound at reasonable prices, the Starlight USB might fit the bill.