Unless the only applications you run are Word and Outlook, *DO NOT* get a MX4000. Heck, buy a used 4400 Ti for the same price, you'll get 3x better performance. 😀
There are far better options. Even a Radeon 9250 is better.
Still better is a $100 card. For that amount you can get a Radeon 9600 Pro or similar.