Zilla,
I'm not trying to fan the flames here, but is it possible that your cheap, mass market Sony is introducing the digital glare that you hear?
You have a very expensive amp and speakers, but you're using a mid-fi digital front end.
I would bet that a high end CD player like a Resolution Audio Opus 21 or (insert high end CD player name here) and a Radio Shack Gold interconnect will KILL the Sony sonically, regardless of what interconnect you pair with it.
I'm not saying there aren't differences in sound when using different cables, but I do think you might be missing THE BIG BOAT and looking for a dingy to "float your boat".
I could be wrong and the Sony 333ES might be one of those rare "you get WAY more than you pay for" components, but I doubt it.............
Enjoy,
TIC