Quote Originally Posted by mikekim View Post
buy a cheap larger case 30-40, and the best gfx card that will fit you mobo, with the money left over in your budget

This ^

Then use the dual core for the slaves and the celeron for the main.

You can use the task manager to watch cpu and memory usage and find the real culprit. WoW is cpu intensive not gpu. Set all of your graphics settings to lowest amount and reduce resolutions.