I agree with you
to install windows 11 on "unsupported" old hardware is waay easier than trying to get win xp to run on newer components
even LTT showed some ways to make this possible
https://www.youtube.com/watch?v=NivpAiuh-s0
the best hardware for windows xp (officially supported) is, in my opinion: (didn't research a lot tbh so you might have a stroke reading this)
E5 2687W v2 (it has 8 cores@ 3.4ghz; I think it has the best balance between cores and speed)
or E5 2690 v2 (10 cores @ 3ghz if you need more cores)
Asus rampage IV extreme (has drivers for every version of windows newer than xp, even xp x64)
64gb of ram (if you do some kind of work like editing & stuff that requires lots of memory; if not, 16gb is enough for win 11)
you can mount m.2 ssds if you get one of those PCIe to m.2 adapters and here you can choose whatever you want
gtx titan black i guess is the fastest gpu for windows xp, but i would go with a gtx 980ti (but you will need to modify the drivers for this one)
some seasonic 700w 80+ gold or better power supply is good enough for this config
whatever case you like that has good air flow too and you can even water cool it