Need help building a system

Hello, I am new to the whole building a computer scene and was coming here seeking help. My budget is the $850-$1000 range and I need a good gaming rig. Super HD graphics aren't what I'm going for, I want something that can put out a constantly smooth FPS at around medium settings for most games. I don't play too many First Person Shooters and stick to mostly MMOs/Strategy games. Any help you can provide would be very appreciated.