Best speaker cables for longer runs


I realize people like to keep their speaker cables short, but a redesign of my rack placement may necessitate runs of 20 feet or more. Any particular brands work well under such circumstances?

I have a theta dreadnaught ii and b&w 802d. Cost may be an issue as price does mount up.
diw
Post removed 
*I currently use Nordost Blue Heaven,.....But I would like to substitute something that won't sound worse.*

I bought a set of bi-wire 15 ft. DH Labs T-14's used for about $200. Very happy with them, at the very least they don't sound "worse" than Nordost Blue Heavens.

PS-you may pay thru the nose for long runs of name-brand cables new. Used, the price can drop drastically.....
My equipment is on the side also which means I run 21 ft speaker cables. I currently use DH Labs Q-sonic which is silver plated copper in a bi wire configuration. These cables sound excellent with either of my two very different speaker/amp combinations, which currently is W4S ST500 to Nautilus 802 or VAC PA100 to ESP Bodhran SE. As I recall, the price was under 800.00 which is very reasonable considering the quality and performance.

I still have the OCOS cables with enough adapters to run single or bi wire but they don't impress me with either amp or speaker. I have Audio Magic Excaliber single wire which sounded great with the VAC powering the 802's. The ESP's absoulutely require a bi wire run. I also have a run of the MAS hybrid cable that is pretty good but I prefer the DH Labs and Audio Magic over that one.

Do you plan to run single wire with jumpers or bi wire?