https://www.pcgamer.com/gaming-pc-build-guide/

You don't have to spend a ton of money to get a great gaming PC. Choosing your own parts is the best way to build a gaming PC that suits your needs, and our build guide is here to help you assemble an awesome custom gaming PC that will be future proof. It should still be able to play games at high settings two or three years from now.

The best budget gaming PC (~$750/£750) - A good entry-level system.The best mid-range gaming PC (~$1,250/£1,250) - Our recommended build for most gamers.The best high-end gaming PC (~$2,000/£2,000) - Everything a gamer could want.The best extreme gaming PC (>$4,000/£4,000) - You won the lotto and are going all-in on gaming.