I hate to burst your bubble, but that's really not an "upgrade". The two processors benchmark at nearly the same levels. And if I'm not mistaken, don't the Prescott have a bit of a heat issue?
Personally, I would of just stuck with the AMD, perhaps upgrade to a dual core...
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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