my cables consist of 12 gauge Karma bi-wire and "cable pants" to match from Knu, along with white techflex and white heat shrink tubing from eBay, and a 24 pack of Sewell Silverback banana plugs from Amazon. The techflex will cover the main run of wire, the 'pants' will go where the outer insulation is stripped back, and the heat shrink will secure the techflex to the 'pants'.
This wiring will be for my front 3 speakers (KEF 104/2 bi-wire, and 200C bi-wire center) that go to a wall plate beneath the HDTV. I have CL3 in-wall 12awg 2C and 4C wire to go in-wall to the plates and the AV rack in the next room.
I think some nice white cable with black boots at the speakers and plate will look classy, and should work well for my bi-wire setup as well.
Incidentally, those Nak plugs look just like the eKs banana plugs Knu sells, too. Same split design. I've used some, and they do provide a very tight fit in a binding post, but they're a bit weak, too. I had one break on me before I even had it secured on the end of the wire, when I was constructing some cables once. Now I just use conventional silver or gold plugs instead, and locking RCA connectors for interconnects.