Okay so I have a 800 dollar limit, for everything it shipping and all, I might be able to squeeze an extra 100$ because I'm selling my Xbox, I wanna know If I should build or Buy? Like I want a computer that can run BF3 on High At 60fps, And I found some computers online that fit my price-range and there good gpu one has a 7770, But with 800 dollar I need a OS, and everything for a computer to run, I don't need a monitor or a mouse and keyboard, my xbox is going to be paying for those, and keep in mind I'm only 14, and I live in Canada so newegg.com won't help only .ca websites, can someone help me pick parts for a computer and put an OS in the build. And I don't want to pirate Windows.