Power Supply Question

3 weeks ago, we broke ground on our extension l, which I’m very excited about as I will have new room which will be for my hi-fi!

So, as I can select everything from scratch, I am going to have a dedicated mains supply for the stack

I’m thinking radial spur to its own breaker on the consumer unit? Is that right or should I put a dedicated sub-main in?

But the real genus of my question, is should I use a particular mains cable? Furutech produce a number of them but interested to know what others have done?