Transparent Audio gets my vote as well. I have a Nordost Blue Heaven which I will soon replace with a Transparent Audio cable.
The Transparent cables use a network which does several things. One of the things it does is provide a low-pass filter to block ultra high frequency (1.6+ mhz) signal noise. This eliminates a major source of noise in the audio range.
I tried their speaker cables and was blown away compared to similarly priced cables.