Well, what're you planning to do on that PC?
If you're planning to do anything but some basic work and streaming, I would recommend a better CPU (or maybe just get a new CPU for a faster system in general).
I would recommend a GTX 750 Ti as it can be brought forward with any system that you plan to get in the future. It is also pretty cheap and should do well on anything you throw at it (as long as it isn't really graphics intensive such as video processing or gaming).