I have the same spec (pretty much) workstation as you intend to buy. I do high-end commercial VR archviz using Vive. It’s expensive but you’ll get the best VR performance and reasonable Lightmass build times. Go for it!
Edit: Buy a Dell 43 inch 4K monitor and use it at 100% desktop scaling. The huge desktop area this gives is super useful in Unreal. Couldn’t go back to less than 4K now…