Spec requirements for Live Events & VR

I’d like to use UE4 for visualising lighting systems for live events in VR, including moving lights and sets, mainly within blackbox venues. I’m struggling to get an idea for the requirements for a system for me to run this on. Can anyone give me some pointers as to what I’d need to get running well? I’m building a new PC but I’d like to avoid dropping several $K on this system if it’s possible.