I need a bright detailed 300 used speaker cable

I recently purchased a pair of Silverline SR 12's and find them toooo polite, soft, and rolled-off in the treble when using Linn LK20's. I need 12 ft or longer, and would prefer a bi-wired pair with bananas, but I can live with single-wiring. I've heard that Nordost might fit the bill.

Suggestions?

Thanks,
Steve