Well, it seems I know the direction of my future VR experiments meanwhile. It'll be Oculus Rift and SimLab Composer VR (400 + 200 p.a. Euro). SimLab Composer comes with a free dynamic Rhino3D plugin. It will enable me to move or fly smooth through my Rhino projects. Furthermore it's possible to add interactions. Sounds great to me. Now I need to talk to my wife about the money :-( At least I will be able to inspect the grabbed EU geometry in VR.