I'm going to make this really super simple: Start with the Dell Inspiron 15" 7000 series. You don't have to choose this particular machine, but it's an excellent baseline for the Skylake laptops that are now coming out in terms of both price and features. One neat touch on this particular machine is that it ships with a single 8 GB SO-DIMM and an empty slot for whenever you feel like upgrading. All of the laptops are now in the process of upgrading to Intel Skylake (aka "Intel 6th gen Core") so it's probably best to wait for that to roll out everywhere. It'll take through the end of the year for all of the manufacturers to update. The aforementioned Inspiron is out of the gate early and seems to be awesome. Might even take a look at the Amazon SSD equipped version.
Looking for something with a more robust build and premium appointments? Dell XPS 15. Smaller? Inspiron 13 or XPS 13. More gaming-oriented? Probably the Lenovo Y50, although we're still waiting on a Skylake version. Want the coolest, expensivest, fanciest thing on the block? Surface Book.