Other "silver" spk cables.....

Goertz AG series product line are silver, not silver plated copper. At this point though, you are starting to get pretty pricey. Sean
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Phasecorrect,

Also try:
Homegrown Silver,
Audio Magic (expensive!),
Silver Audio (seem to be very good value for money)
DH Labs Air Matirx ($199)
Kimber KCAG
Harmonic Tech Pro Silway
Pure Silver Sound (PSS) Octet

Ohlala, you mean RS Audio by Richard Sachek? FWIW, their cables got an outstanding review on UltraAudio by Mike Silverton.
http://www.ultraaudio.com/equipment/rsaudio_solidsilver_interconnects_speaker.htm

I have a pair of Silver Audio Symphony 48's and really like them. Before that I was listening to Acoustic Zen, and some Cardas speaker cable. I felt the detail when listening with the Silver Audio was superior. A lot of what you hear is going to be about your system and YOUR ears!

I use RS Cables, pre-power, cd-pre. Richard provides a 30 day trial period. Your ears will be your best advice.
Good luck.