There really isn't one, you are due for an upgrade of everything. A gtx 750 ti would work fine but you will probably be bottlenecked by that cpu in most games.
My budget can not allow that at the moment. I am looking for a videocard that can handle games like Smite,or Counter Strike GO.
My current VGA is HIS Radeon HD5750 1GB GDDR5
I'm running a 7790 with my E8400 and they compliment each other quite nicely, I don't game on that rig but I might be able to run some generic benchies if you are interested.