My recommendation is to wait for the GTX 1050 refresh of the Dell XPS 15, and then grab the best 1080P variant that you can afford. Alternately, you could wait for the new XPS 15s and then buy a GTX 960 refurb/overstock/used unit on the cheap (albeit without much longevity).
Build quality is much more important for mobile purchases than desktops, and Dell has a proven record of solid units in this space. Alternately, the i7559-763BLK is a great deal (especially if it gets refreshed with Pascal).
Whatever you do, avoid the "3K/4K/5K monitor" craze. It'll kill both your battery life and frame rates. Also, be sure to read reviews on individual laptops, as gaming performance is based as much on design as specs. Expensive parts will perform like cheap parts if they are thermally constrained and throttle.