Good, quiet cases.

[Pictus]

I am gladt to help, not the P14, but P12 vs P12 RGB 0dB

 

[PaulieDC]

I have been using the BeQuiet Silent base and use it in an inverted setup.
I am going to move to the Silent Base 802 which gives you flexibility in passive soundproofing as well as a mesh option or a combination of the two approaches.
I am also going to install my first All In One radiator cooler as well which will be interesting in an inverted setup.
I have been very happy with the Be Quiet cases and fans.

Joyfully,
Simeon

Another Vote for Be Quiet cases. Great cases and a price tag to match!

A less expensive option is the Coolermaster Silencio S600. I built PCs for two local churches for their streaming rigs, and I had to pop in a couple RGB fans so they could visually see the PC was running, to remind them to turn it off! Even running in my office when I built them and did the burn-in time, this case is really quiet. I added a couple more fans in the top and front and it didn't make a difference. the side panel is glass but it's quiet because it is pretty dense, heavier than you expect when you remove it.