Dang, WOM! Where did you get a deal like that?

I wish I could find it for that much. I have been shopping around and the cheapest I have found XP Pro Full version is at NothingButSoftware.com for $219.95.
I have thought about the XP home, but I have had W2K for 2 years and have never had one problem out of it and they say that XP Pro is built from 2000 so that's what's pulling me toward pro.
About the upgrade...I don't have the W2k CD itself, all I have is what's on the gateway system restoration kit that came with my comp when I bought it. Will that work? If so, I'll for sure go with the upgrade version instead of the full version and save some money.
Okay, here I go again getting confused.
Thanks for yall's help