Longish speaker cable

Somewhere in the future I might want to re-arrange my audio set-up. Right now my system stands between my speakers. However I am think about moving the system and letting my speaker stay where they are. Right now I use NBS Active IV speaker cables. These are 6 or 8 feet long.

If I move my set I would need speaker cables of 13 to 16 feet long. Speaker cables are very expensive. So I might have to take a step back.

So what are good and affordable speaker cables? Nordost White Lightning, Purple Flair? Kimber 8 series? Pink Faun SC3 etc. Before the NBS I had Wireworld Atalantis 5 and before that Nordost Red Dawn ref2.

So what cables are cheap, good and long?