My advice is... Mogami, and Canare is another, both available from World's Best Cables on Amazon, see: Canare 4S11 or Mogami 3082 Once you are accustomed to these, you can try borrowing some Cardas, Audioquest, Nordost, Transparent or other higher priced cables.
Good advice: Mogami/WorldBestCables/Canare/Belden (actual cable manufacturers) or other Speaker cables on Amazon. Read the descriptions/diagrams and reviews carefully. And you can return easily!
Bad advice: Higher priced cables from resellers so called major brands (they buy or import cables and dress them with thick jackets and you pay 10x 20x more