I doubt he'll need a powerful CPU? I mean I have a 7700k and it still runs great for modern titles. Seem usage around 50-70 and temps at 43-50c. I'd go water-cooling with the extra money if you can. This could mean your brother will play with a water-cooling loop on his CPU which makes the temps low and he can probably overclock to 4.8-5.0GHz. GPUs are a little hard to get these days, the RTX 2000 series stocks should be back soon and should be enough. I hope this could help you out.
Idk if this is related in this category and I'm new to the forums so... Since this Summer I think Linus went on http://thebannervault.com the website never appeared on his pc. Linus wants to try and get the NCIX web page (I think) off that website stated on the WAN show back a few months ago (Summer). I will attach a picture. But the page never loads and causes a 404 error causing the server to close the connection on me. However Console on chrome tells me it's trying to load www.thebannervault.com So I don't know if the server is still alive but the IP and the NGINX is still activ