I was fortunate enough to discuss the topic of mic line quality with Les Paul. He said it soes'nt matter because you are hitting an EQ anyway (only consoles in his world) and between the EQ and positioning you will make the mic sound as good as it possibly can. A poor mic or instrument will sound poor.
I was forced to consider Kimber on a job years ago for a rich client who was being sold all that stuff. "You are so important, so you have to buy this solid silver speaker cable for your NS-10's" kind of BS. It did not matter that I mentioned that the signal hits 32 GA wire would on a coil anyway. Not that you want to use 24 GA speaker cable to wire your NS-10's. We tested Kimber against Rapco 10 GA speaker cable with 30 foot runs Bryston 4B to BBSM-4's and no one could hear a difference. Kimber mic cable was the same, no matter what the length. Using Kimber mic cable as guitar cable "just like Lou Reed does!!" made the worst sounding capacitive guitar cable. I called BS on the whole thing, installed the $50 per foot or whatever cable and finished the job.
Recently I have seen more and more engineers whom I respect use the "sound hose" (?) speaker cable and they swear by it, but I have never been in a position to compare. It is something that you have to listen for yourself and be the judge.
Regarding studio cables, I think that durability is a big part of the equation. "A cheap man pays twice", but you DON"T have to become poor buying cables. I use gold plated connectors because they do not get tarnished after 5, 10, 15 years of use. I use braided shield because it is durable and "holds it's spec" over years of studio abuse. I cannot say that Neutrik connectors sound better, but for quality, install ease, and price I use them exclusively. Gold plated. For cable I use Canare L-4E6S quad for studio mic cables, L4E5-C for turnarounds and mini-snakes, GS-6 for guitar cables with Neutrik shorting jacks on one end, and for guitar runs over 40 feet I use Gepco "X-Band" cable. I tested a 290 meter run connecting guitar to different amps and it "sounds" the same as a 2 meter cable. To the engineer and the guitarist. A 40 meter installed tieline run with panel connectors and end cables sounds the same as just one short cable.
I have the Canare/Neutrik combination in use for over 17 years in some places, and the velcro cables ties wear-out before the cable/connectors. No way I can say that about Mogami/ whatever, Belden/Switchcraft or other smaller cable brands and combos.
If you compare prices for ready made cables it is worth paying 50% for the Neutrik/Canare combo. If you are making them yourself, it is a no-brainer. Use the quality materials.
As far as length, you will have no problems running any of the above cables over 100 meters. What you have in the WALLS is a totally different topic.
Mike