The top of the line quad core Phenom is roughly the same speed as a mid-range Q6600 CPU from Intel.
The dual core AMD you listed is quite slow. I see too much difference lately in gaming with fast CPUs to recommend it.
Here is a nice CPU comparison. It's done with a very fast graphics card, so that you can see how much the CPU will hold back the various games they tested:
http://www.legionhardware.com/docu [...] d=775&p=10
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