Put more money towards a CPU such as a Quad Core, GFX you can replace often, CPU's can be a lot harder.
I'm assuming that means a Graphics Card.
Anyways, I know of a local shop that can upgrade my computer, cheaper if I supply the parts. I'm not going to be doing a lot of Video editing and other stuff right now which actually needs more than 2 cores.
The real question is are the parts compatible with each other?
The motherboard is capable of USB 3.0, SATA-III hard drives, and Six-Core processors. I have a 700 watt supply going to the card. I'm sure its compatible.