I don’t think a laptop in that price range will work. But this will:
AMD FX-6300
ASRock 970 PRO3
Corsair DDR3 1866 8GB (2x4GB)
WD Blue 1TB
EVGA GTX 960 4GB
Raidmax ATX Case w/500W PS
Total: $588.94
I built a slightly lesser version of this (FX-4300, 1600 mem, Extreme3 M/B) and get 120 fps in the editor with the starter level loaded.