If you have money to spend (which I would assume you would since you mentioned a MacBook) look into the MSI GS60 GHOST. Its pricey at $1799 but it's thin, light, and powerful. Otherwise look into a Lenovo or Asus if you just want power rather than form. Despite the hate, Alienwares aren't really THAT bad either, but they're significantly overpriced.
XBL A Killing Pie~PSN A_Killing_Pie~Steam Scooby Doo "I'm going to put my quantum harmonizer in your photonic resonation chamber!"