i need a new laptop

hey guys after having a macbook for over 2 years and realizing how much it sucks for runescape i need a new computer! I want one with windows 7 and can run things like runescape etc fast. I have always used apple products so i don't know any good pc computers. My price range is 450-700$ Im not buying one on here so don't advertise please.

OR IF YOU CAN TELL ME THE SPECS I NEED TO RUN THINGS FAST WITH NO LAG POST THEM HERE!

THANKS!