I think you need a little more ram and a little better graphics card to make that computer useful. I know WOW isn't THAT graphic intensive, but those cards aren't really for gaming, I think they will give you lower Frame rates.
I sent you a pm by the way .
If you have any questions at all, let me know. You can message me on aim or yahoo at anytime, Maximus9102.
My advice? DO NOT TOUCH BUDGET DIRECTX10 CARDS!!! try to stretch to an x1950 pro cos it has good price/performance and not too expensive (google it for exact prices) And i would recommend you buy a better power supply than the one that comes with your case (you only need to spend about £20/$40 to get a good enough one)