Cables are without question (in my opinion) one of THE most important items of recording gear, and often the least regarded.
Its also humerous to me when, in the past, people have laughed at me for using only a certain kind of solder for my cables. Fact - it makes a difference.
I remember when I was making the looms for the studio here, and I had to go to LA to run a session in a well known large studio for a couple of weeks. I had worked there before, and I knew their wiring was over 12 years old. So, I loaded one snake / bay / D12 assembly into the car, with some of my new
quad mic cables etc. Ran it from the tracking room through the double doors (rubber seals!), the hall and into the control room.
Patching from the studio's set to my set revealed a VERY big difference in sound quality. Needless to say they quickly rewired the place. (should mention.. cable technology has improved a lot over the last 6 years).
A company like Gepco manufactures a lot of cable for other (well known) brands. They sell direct from the factory and really do make some of the best cable available, be it quad, normal mic, digital. You can save yourself a small fortune if you do it yourself. If you cannot do it yourself, find someone local who can solder for you and pay them - still cheaper.
All the other makes - yes the cable mogami etc make is good. the manufacturing quality - no. Therefore I do not think its worth it, my own cables will outlast any manufactured product. Every joint is soldered carefully, every solder point covered with color coded heatshrink. They never break.
However, it should also say that for 'special' cable - especially AES, SPDIF, instrument direct in, microphone direct in, I do use Zaolla cables with pure silver cores. Very expensive, and completely worth it for the difference they make, especially the digital cable. This difference is not subtle. If I, for instance, swap the AES cable running to the D/A in the monitor path for a Zaolla, anyone, trained ears or not, can hear the difference.
The same goes for a keyboard / direct / DAW combo.
For health reasons I should point out that I have nothing to do with Gepco, but I am a Zaolla endorsee.