Best gaming pc build for around $500?

I'm not look for a pc that will play crysis at 60 fps or SUPER fast speeds or something im looking for a moderate gaming computer for some light gaming, lots of internet, music, videos(HD plz), i do NOT need windows7(got it), mouse/keyboard, power supply(i have 650W ultra i just got last week), nor a monitor. Please send me a complete list of good gaming components (except the above) that are $500-$600 thanks i appreciate it tons(: