Greg,
On Warren's point regarding 64-bit software -- if you're going to get 4 GB of RAM, note that Windows XP only supports up to 3 GB. Now, I'm not sure if the 64-bit versions of XP support more than 3 GB. This would mean you'd need to get Vista or Windows7. This would mean that you'd have to double-check all your software to ensure it runs in Windows7, or at least in some kind of XP compatibility mode.
H
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