Final Cut Server is not the tool you want if all you are doing is sharing large files. It is more for project collaboration than file charing. For file sharing, you need a SAN. XSAN (Apple's shared storage management system) is not very Windows-ready for editing, though, it makes a nice pairing with FCSvr. That's what we're running at my studio. You can make it work, but there are, IMHO, better options for Windows machines.
You might check out Studio Networks. They have a couple of scalable solutions depending on your budget constraints and your needs.
http://www.studionetworksolutions.com
HandyGeek
