My entire rack is Phoenix Gold entry level stuff (about $5 for a 6' interconnect), and thats a sh*t pile of cable.
Of course, cables are the most controversial topic in all of audio (and thats saying something, IMHO). I personally would spend my money on good sounding software rather than cables, were I you.
And just to begin the decent into the mud where this thread is ultimately headed, I recently won a Nordost Blue Heaven interconnect. This things lists for $300! I A/B'd it against my old standby Phoenix using Bob Dylan's Blood on the Tracks SACD. The result? My ears heard no difference whatsoever, so I traded it in even on a phono pre-amp. I feel like I got the long end of that stick.
At the end of the day, you need to swap a cable and do your own A/B test. Don't let me or anyone else tell you that a cable does or does not make a difference. Its your ears and wallet that matter.
Since your eyes are more sensitive than your ears, I tend to favor budget audio cables and good quality (bit more expensive) video cables.
Phoenix is probably fine for audio, subwoofer and coaxial-digital.
You might even keep it if you are running standard component video to anything and dont notice any problems.
But if you are running progressive video or HD video: Check to see if your cables say anything about "HD Rated" or "HD Compatible". If not, then consider upgrading to something ment for the higher frequency signals.