After a lot of thought and suggestions from all of you, I've decided to beef up my old machine a bit and use Windows Server 2008 R2. I was able to obtain a copy of this at a discount, so it makes more sense. Also, it's nice having the version with all of the features... I guess I'm a "just in case" type of guy.
This is going to be quite a project, and if I can get my hands on Microsoft Exchange 2010, I might put it on there too. It'll be nice to play around with this and host my own Exchange server too. I'll keep you all updated.
