Pistol Pete1:The 'Clearer Audio Copper-Line Alpha' looks interesting.......
I have the Clearer Audio Copper Line Alpha powering my Onkyo 905 - it's certainly improved musicality though it's hard to go into detail as I never did a clear before and after with music. All I know is, previous, I preferred the Stereo mode, after, I preferred the Pure Audio mode (which seemed harsh on the treble before). Given the 60 day money back guarantee with Clearer Audio (which I've tested as I originally got a Silverline cable), it's definitely worth a try as you have nothing to lose.