I have bought a new gaming PC and have someone interested in my old one. Any suggestions for a price?

https://www.coolblue.de/produkt/892444/lenovo-legion -t5-26amr5-90rc019gmh.html?srsltid=AfmBOoorW30dzR -MSpbCqDI_VFrRLQ1SeR11-7UTTzjbYanpGU21VmcQ

It's actually a cool PC, but it's just sitting around here.

I'd sell it for 850€. Is that too little? Too much? I haven't negotiated the price yet, but I will later today.

I will give a samsung curved screen fpr free on top.

Happy for suggestions.