You left out what graphics card you have. If you don't have a discrete graphics card, don't expect to play any 3D games.
The GTX 650Ti is at a great price right now and can play all games on High + FXAA. You'll probably need to get a new PSU - about 400w or so, though. If you don't want to upgrade the power supply, get an HD 7750 - good for Medium + MLAA in all games.