PC Power Supply

After 5 years of use, my laptop is almost on its way out. The power connector is loose so the battery doesn't charge very easily, the keyboard is pretty rubbish and the system has little errors/"bugs" that I have to put up with, making it slow and tedious sometimes. Consequently, I am in the market for a new computer and I am probably going to get a desktop PC, either pre-built or perhaps more likely, build one myself as I want to customise every aspect of the system to my own needs and understand in more detail how computers work. I'm leaning towards a gaming PC spec as it will favour audio/video applications. My computer is my main source of audio enjoyment so squeezing the maximum sound performance out of it is a top priority. So on to the basics of a computer build, I need to choose how I am going to power the system as clearly high quality power supplies have huge significance on audio signal fidelity. So is Graham or anyone else here able to recommend a PC PSU that will do music justice? Or Graham, can you build a quality PSU mains PCB if I provide the metal enclosure? Obviously this will power everything in the PC like motherboard, CPU, GPU, SSD and any other peripherals I wish to add. Would such a PSU help to improve the computer audio or am I completely misguided?

Well I would use the Majestic/Enigma as my "soundcard" but its input signal in the digital domain will still be subjected to the computer PSU noise. Just wondering if a GS-style supply would help to remove some noise from USB. I don't believe that the digital domain is immune to noise/interference.

Wow, thanks. Then I assume the only additional thing I need to connect is either a touchscreen or screen via HDMI and mouse via USB in order to interact with operating system and select a track to listen to? What determines what file formats are recognised? RPi CPU will process FLAC or WAV?

Thanks. I can only apologise for my embarrassing lack of education when it comes to apps and electronics technology.  I'm only 30 as well.