I agree with KarsusTG. The little bit of extra money is worth it to bump up to the gtx1060 with 6gb of dedicated ram. If you could go 15" you can get the Acer Predator Helios 300 or the EVGA SC15 as well.
Since you already have a 1080ti I would probably just hold off until the new cards come out. But worst case scenario, if you are set on buying it, you could just buy it and sell it when the new cards come out.