Look in the Belden Brilliance series. Tastes differ, but personally I like some of their AES/EBU 110 ohm cable. 1800B, 1800F. The second is larger but more flexible.Then there is the 1508A, highly flexible,twisted pair audio cable, 24 awg. Great to work with and a size that will fit a lot of smaller 3.5 mm connector openings. You will not see a lot of hype from Belden but their quality control is second to none. Markertek also sells a lot of Belden as well as West Penn, Mogami and Canare. For balanced four conductor cable I use star quad made by Mogami or Canare. If you want good 3.5 mm trs connectors Mouser sells the Amphenol KS3PC in nickel or gold plated. They are extended to fit some hard to fit headphones as well as smart phones and other devices that are encased. I wish I knew of some quality TRRS (three ring connectors) but none of the major companies make them yet. You can get them out of China but personally I would not use those and you best have had a lot of soldering experience if you try.
Someone asked about smc crimp or solder. I have used both and for the crimp you have to have the proper die sizes for the crimping tool. I have maybe 10 different sets and match them up as needed. Soldering would be easier and you would have more cable options. You can find both types of SMC plugs on ebay last I looked.
One thing I forgot to mention to one person on here, if you use a solder pot to work with Litz wire, be sure you get some liquid rosin solder flux. You dunk the wires in the flux just a bit maybe 1/8 of an inch and then into the solder. You may have to do that a couple times and you have to be certain the solder pot has reached its maximum temp. The coating will rise to the surface of the solder as black clumps and you will see when the solder is adhering properly. Do not add rosin flux directly to the pot it is not a good idea, use solid bar solder and keep the flux separate. Those of you who have learned proper soldering will know about heating the joint first when using rosin core solder.