It should be a gaming PC.
Would recommend Agando to you
You can put together one yourself
DIY would be cheaper but no guarantee
Ready PCs I would be careful and rather not recommended
Here you get a hot and cheap one for 700 eur:
https://www.hardwaredealz.com/bester-gaming-pc-fuer-unter-700-euro-gamer-pc-bis-700-euro/
https://www.hardwaredealz.com/bester-gaming-pc-fuer-unter-700-euro-gamer-pc-bis-700-euro/
Agando is not recommended at all. Way too expensive
Build your own, most of them charge 100-200 euro only for assembling
What is too expensive about it?