Very nice. I too am in the process of building an XP machine just for MVP2005.
Our IT department at work replaced a number of old Windows XP PC's on the manufacturing floor and raffled off the old ones for free. I was able to get one of them so I grabbed one of the mini-towers and they threw in a keyboard, a mouse and a Windows XP Pro CD.
When I opened up the PC, I found (along with a LOT of dust) that it only had PCI slots. Even though it does play the game, at a minimumI wanted a PC with an AGP slot so I could add a graphics card, like our 2004-era office PC at home that I currently use toplay the game.
Lately, eBay has been my new best friend. I bought a motherboard (2.8 GHz Pentium with 512 MB RAM) with an AGP slot for $23 and the same video card (Nvidia GeForce 6200 with 512 MB RAM) I have in our office PCfor $5. I bought 2 GB of memory for $10 andsome Arctic Silver cleaner andthermal paste for $10 since the CPU heat sink has to be reattached. All togetherwith shipping, I've spent about $75. I still need to get a monitor, but I've got a 17 inch monitor from work that I can use for a little while. I've seen some used 19" flat screens on eBay for $30 - $40, so I'll pick one up at some point.
Now I just need to find the time to put it all together, reformat the hard drive and reinstall Windows.