I'm gonna zig while you guys zag and say Lenovo Thinkpad P50! Quad core i5/i7 with 15.6" screen. Skimp on the Xeon and GPU options and you should be able to stay in your budget. You will have to use it with the screen fully open like a giant book, but it gives you quad core muscle on a giant AES screen. If you are OK with 1080p on such a huge screen, check it out.