I recommend buying a hp Proliant DL360 G4 from ebay. I bought one from the ebay store SavemyServer, and it was $100. No problems with it and Im running server 2008 trial for testing purposes. I also recommend, if you don't want to spend tons of money, you look into Ubuntu Server. It's free and has open-source equivalents of many windows based programs, difference is they are free; hence the pen-source.