I am a game developer, and I need a new laptop. I need 8 gb of RAM, an i5 or i7 cpu (preferrebly i7), and a 15.6" screen. It NEEDS to run Windows 7 64 bit. Any version of windows 7 will work as long as its 64 bit. And a hard drive of about 500 gb. If possible, I would like it to have an aluminum chassis. My price range is about 800 to 900 dollars. Any ideas?