I am sure the DIYCable cable kit is real nice... I spent a lot less, and am still really impressed. I would rather have the DIYCable kit, I just want to point out that you can do it for as little as possible, get good cables, for main or second system, whatever.
Also do you realize that Canare and Beldin are not catering to audiophiles... They sell stuff in bulk for people that setup concerts and industrial stuff that is super sensitive, has to be used in all sorts of conditions, etc... I mean the reason for them having all the specifics is pretty extensive beyond our little world!