Siragent :
I plan on also purchasing a newer 700W power supply so I will have enough to support the graphics card, aswell as a newer CPU. I was just concerned about the case size and the graphics card size.
Well I would hold off then. You see you have a very weak CPU which may pose problems for a new GPU (not being able to support it completely). Looking at your computer, the socket (type of processor) your motherboard supports is AM2+ which is a dead socket (no longer making that type of CPU). If you are wanting to play games better, it wouldn't be a bad idea to just save money and build a new computer that can support new hardware.
Also, you don't need a 700w PSU. That's overkill unless you want to do 2 higher end graphic cards. What games do you want to play?