Because in your price range you'll have to get an FX 4100 or 4300 which is a dual module CPU, in other words dual core with physical HT, with less IPC than an i3 3220. I've stated that before in my thread. I'll make my point.
AMD FX-4300 3.8GHz Socket AM3+ 8MB Cache Retail Boxed.. | Ebuyer.com
Same price as the i3 basically, labeled a quad core, it isn't. And it's slower than the i3 at everything, including gaming. I prove that here
Actually, my whole thread is dedicated why not to get sucked into the AMD marketing lies, and how a dual core is perfectly fine for casual and even semi hardcore gaming.
Your CPU and modern games: A guide to those building.
Short and sweet, the i3 3220 is faster than your Q6600 and the Xeon you were looking at as a replacement. Especially at WoW. So unless you want to buy an H80i and clock the crap out of the Q6600 you're better off with the i3 that has faster RAM, more memory bandwidth, is capable of utilizing 16GB of RAM, and has a better upgrade path over the dinosaur.
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