Sorry to get off the thread but he posted here. Miken please post questions like yours in your own new thread if you could. That way the Original Poster know whether they're particularly the one being spoken to.

To allow folks to better help, they'll probably ask for more details on your current computer. Based on the current specs for your computer, you may need a new motherboard to take advantage of the latest pieces of gear, essentially a whole new computer. Particularly you would need a board with the proper CPU socket for the processor you would like. An upgrade to your PSU would probably also be a good idea, especially if you've currently got a pre-made computer from any of the Brands, like Dell or HP. A computer capable of dual-boxing, even 5 boxing, should be manageable on a budget if that's a concern.

Also, there's little point to upgrading everything else and leaving the graphics card from several generations of technology ago. Much of the discussion of what limits WoW performance is based on the upper-tier components with benchmark testing. If you have a poor graphics card, a huge upgrade to your CPU still won't result in a strong increase in performance. Likewise if you have a strong graphics card and a poor CPU, or less RAM than would be required. The key for PC gaming is to strike a good balance in your setup. Besides, with the release of Cataclysm, World of Warcraft received many graphics upgrades that put much more burden on the GPU when you turn the settings up.