sounds like a good system. :goodjob:
Too bad your mobo only has the 865P chipset instead of the 865PE, though...better performance and built-in RAID 0 for the SATA channels.
As for XP, you're probably gonna have to reinstall it on the new drive anyway, since the hardware is different. Check around for an OEM version of XP Pro...$140 at Newegg.