Two types are suggested here from Furutech. The GTX-D Gold and the NCF. Both best the last king of the hill wall receptacles. These receptacles are built like a tank and feels like it! Once in your hands you know you have a quality component and the craftsmanship is top notch. The mechanism accepting the bare wire is of a patented design and offers the best connection possible. The female inputs hold on tight to the male plug without damaging them like so many hospital grade receptacles do.
How to choose between both? The following can help you in your choice of receptacles. Basically if you have a solid state amplification you should consider for the GTX-D gold for a smoother rounder sound. If you have a tube based amplification you should consider the NCF type for more resolution and details. Having said that a mix of both is also excellent and can lead to even better audio system satisfaction.