this is just something i've been really interested with
though, for me personally, i think i'd have them be two or three different computers:
Computer A: OpenBSD/Windows 98SE, Pentium III, Voodoo 3, 512MB RAM, 800x600 monitor (for old games mostly, or messing around with ancient software)
Computer B: Windows XP SP3 (32-bit) or Windows 7 32-bit (dual-booting with Alpine Linux); Intel Core 2 Quad, GTX 650 Ti, 8GB RAM, 720p 16:9 monitor (for Touhou, Vocaloid/UTAU producing, and older Minecraft)
Computer C: Windows 10 (or 11 but i gutted it)/MX Linux dual-boot, AMD Ryzen 5 (a couple gens behind), RTX 3050, 16GB RAM, and a 1080p 16:9 IPS monitor (for VRChat, more modern games, and emulation - like PPSSPP, Redream/Flycast, Dolphin, PCSX2, Vita emulation, PS3 emulation, etc)
i don't really feel the need for extra beefy hardware, and if possible i'd just want my computers to lack RGB altogether lol (plus i personally find RGB overstimulating)
what would your ideal PC be?