Which way to go for a long interconnect.....

I was about to purchase a 15 foot single ended interconnect Alpha Gortz TQ to run between my ARC LS25 and ARC VT 100 mk2. I was informed that they might be too bright for my system (speakers are Infinity RS 1-B's). I wanted to keep the cost as reasonable as possible but was also concerned about the long lenght between components.
What are you suggestions, and please tell me what you think about the Harmonic Pro-silway cables.....they may be a good match for my electronics.