The Best kept Secret in Speaker Cables please?

Look into Jena Labs, I had the Valhalla's and went to Jena Labs, I don't think you will be disappointed :)

The Sonoran Plateau Desert cables are very good, and very reasonably priced. They are commonly compared with the more expensive Transparent cables in sound quality. I have them on my system, and I find them to be very detailed and neutral. I think this qualifies for your "best kept secret" category, because I think the word hasn't really gotten out on these cables. Build quality is first-rate also. I think they are a high-value product, with great sound for affordable dollars.

Another possibility is the Purist Audio Venustas cables. They are a new line for Purist, and I have heard alot of good things about them from users. They are somewhat higher priced than the Sonoran.

Check out the XLO Unlimited, or perhaps even the Limited. Prana Wire looks to be very interesting, but expensive. For much lower cost, people seem to really like Audience.

I think your best bet is to find out what people have found successful with your amp/speaker combination.