Need help with Gaming PC Build

Hello,http://pcpartpicker.com/p/HV62
What do you guys think about this build? I'm first time builder and have been researching parts but still need help on how to improve this build. I know there is no OS i'm hoping to get one cheaper. My budget is really around $800 so this build is pushing it. I want to do gaming with the pc for MMORPG games where i can set video graphigs to high and still be good for another year or two before they start to come down.I thank you for yout input.