I am in a similar boat. I am going with a white theme. This is what I have so far. Would appreciate any suggestions
CPU: AMD Ryzen 7 9800X3D
CPU Cooler: Lian Li Galahad II Trinity Performance 108.29 CFM Liquid CPU Cooler
Motherboard: ASRock B650 Steel Legend WiFi ATX AM5 Motherboard
Memory: Silicon Power XPOWER Zenith Gaming 64 GB (2 x 32 GB) DDR5-6000 CL30 Memory
Storage: 2x Samsung 990 EVO 2 TB
Video Card: RTX 5090
Case: Corsair 3500X ATX Mid Tower
Power Supply: be quiet! Straight Power 12 1200 W 80+ Platinum Certified Fully Modular ATX
Case Fan: Lian Li UNI FAN P28 92 CFM 120 mm Fans 3-Pack
Monitor: Gigabyte M28U 28.0" 3840 x 2160 144 Hz Monitor
Monitor: MSI Modern MD272QP UltraMarine 27.0" 2560 x 1440 75 Hz Monitor
I'm not too sure about the monitors or the memory
Ditch the AIO. No need. If you feel like spending a lot on a cooler, there's good air cooling options.
Get a better motherboard.
Get a single 4 TB drive with options to add another later, and not the evo.
Get a newer PSU, series 13 out.
You won't be able to run 6000 64 GB, so get slower or less RAM.
Get two of the same resolution monitor or scaling will be crap.