Well, first of all, laptops are not the best to render your scenes.
If you want to work in production you should build a work station.
Budget wise, 2 graphics car at 500$ are mostly more performant than a single 1000$ GPU.
Just beware of GPU memory.
The latest AMD RYZEN processor appear to be very very very interesting price/performance wise.
The 1080Ti is sure a solid choice and you won’t be bothered by memory limits with these 11Gb Vram.
But I think that, if you can a couple of 1070 with 8 Gb will output more performances for rendering and 8GBof Vram are already very nice if you’re not rendering excessively complexe environement.
