Welcome to the world of Naim Sally Horses.
First - I 100% agree with the Hungryhalibut post. Re your question: your Wireworld speakers cables look to be not ideal for Naim; Wireworld don't publish any electrical parameter specifications & I'm only going on what I know about cable construction effects, but I suspect that the complex Wireworld construction will give low inductance, whereas Naim prefer high inductance.
The obvious answer is to go with Naim's NACA5, but alternatives such as any of the Chord Cables will do a great job. (I use Chord Odyssey) But please don't get into mad prices like your Wireworld. In UK NACA5 & Chord Odyssey are about the same price at £30-£35 per meter (plus termination), no idea about pricing in US, but whatever it will be nothing like the Wireworld madness. Finally the length, although I believe its not so important with the new amps, you should have a minimum of 3.5 metres (11.5 feet) per side to get the inductance load.