What do you need the server for? - Are you looking to use it for your database? / file sharing? / web site? - depending on what you want to use the server for and what operating system you intend to run on it as I'm sure you know makes a huge difference when it comes to deciding on the type of hardware.

Personally, I use Windows XP for my workstations and Fedora (Linux) for my servers - we use the servers for SQL and web servers - I find that Linux utilizes hardware more effectivly than a windows server. Just mu 5c worth

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Ian
Florida, U.S.A