If it is a really heavy 3D scene, it is possible that no current hardware can render it well in VR. Using a laptop, the risk is of course bigger.
Your best bet is a laptop with the most powerful mobile GPU available, GTX 1080, but they are usually well over $2000. Example:
For under $2000 you have to step down to the still very capable GTX 1070. Example:
Another option (that I have personal experience with) is to buy/build a compact desktop computer with a small portable display. Adding the Vive the setup will still not be easily portable. You can make a great compact build under $2000.
Do you have any experience doing VR? It is easy to adapt a scene for VR, but it can be tricky to do it well. Also, scaling down the graphics to fit VR is not as easy as for a less powerful normal computer.