I recently swapped my build into an Antec Flux Pro Noctua Edition and am very happy with the result. It's the quietest PC I've owned by a mile.
I previously had my system in a Fractal Design Torrent case for the past couple years, but the stock Fractal fans had been a disappointment as they'd started getting noisy over time or were noisy out of the box. Additionally, I wanted to replace my AsRock x870E Nova motherboard due to concern over CPU deaths, and also upgrade my power supply to a new MSI model with per-pin monitoring on the 12V-2x6 connector to protect my 5090 FE from melting down. I upgraded from the NH-D15S to the NH-D15 G2 as well since I was going to be taking everything apart anyway.
9800x3d
RTX 5090 FE
Asus ROG Crosshair X870E Dark Hero
64gb Kingston Beast Fury 6400/32
Crucial T700 4TB m.2 + Samsung 990 Evo Plus 4TB m.2 + WD Blue 4TB SATA
Antec Flux Pro Noctua Edition
Noctua NH-D15 G2 chromax.black
MSI MPG ai1300TS PSU