T W A U ... The Chase....today's...
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If you are going to work with the PC at home and never connect to a business network then Home is fine.
If you are going to work in a business environment, where more network connectivity is required, then go for Pro.
This list form Microsoft may help:
http://www.microsoft.com/windowsxp/pro/howtobuy/choosing2.mspx
But to be honest you will hardly notice much difference if you just use it for general computing.