Although most people think Windows 7 is a better OS for gaming, I think that it would be better to get Windows 8.1, But whatever you do, DO NOT GET Windows 8 as it will really let you down. Also It'd be cheaper to upgrade to Windows 10; but I think that Windows 10 is going to fail like Windows 8 did, So maybe if Windows 10.1 comes out that'd be a good choice for an OS.