You might have noticed that, when it comes to cables, there are two large groups.
One considers cables as a Heaven's answer to, more or less, everything although, once you read their reports, they are really using them as tone controls. It may not be that bad of an idea for those who do not own your amplifier. Your set-up is simpler to manage, though.
Second group does not believe in absolutely anything that has anything to do with cables. They barely accept that cables transmit signal, it seems, and stop short of claiming that wire hangers are just fine.
These two groups are two parallel worlds that, on occasions, throw all the verbal ammunition they have at each other. Not much to learn there. You will read some of the statements in disbelief.
You seem to be the kind that will end up in the third, probably the smallest, group which believes there may be something to cables but does not believe they are all that matters and leaves mind open that either group may actually have some point. We will see where you settle.
I am in that third group, probably because I do not have particular enjoyment constantly chasing some sound, etc. My balanced (XLR)interconnects are Shunyata Venom. They are the cheapest that Shunyata makes. The main reason for choosing them was that they look like they mean business while being the least expensive out there. They replaced some much cheaper ($15-20) cables. I have had them for months so, if the burn-in actually exists, it should be settled. The difference in sound is about none. If Spanish Inquisition knocked on my door and I really had to pick one, I would probably have to admit that cheaper ones are slightly better. Someone might say that it depends on matching, but someone else may say it is not the case.
My speaker cables are Monster from 1994 ($30 for more length than I have ever needed). I have never directly compared them to anything else so I cannot comment much. Still, they must be transmitting the signal as I have noticed differences when changing any other component. I am following these threads to get some idea and google whatever people mention until I get to some cable that fulfills my criteria (pleasing to the eye, available in the length I need, and works/transmits signal). No luck so far although Zavfino cables came close. They even say they offer different lengths but it is not that clear how to order it.
It may not matter to you, but it is worth mentioning that some of the more expensive cables are not that flexible. It may become a bit of a practical issue, in case you have some angles or tighter places to navigate them through. Luckily, many seem to be so thin that I wonder where the wire actually is.