ocean103-
Designating a Mac as a File Server and turning on File Sharing may be a better solution for you. Apple recommends against using that as someone's someone's private Mac (because File Service would compete with the private use) but that choice is clearly up to you. It does not have to have a fast processor, but faster I/O would be better. In schools, we find that GigaBit Ethernet provides near-Hard_Drive performance for File Sharing. Windows File Sharing is available, too, if you need it.
You can take it a step further an dedicate a Mac to running Mac OS X Server software, but in many situations that is overkill. If you also want centralized Print Spooling, a private Mail Server, Web Sharing, or many other services, a dedicated Mac running Mac OS X Server can be a real benefit.
Message was edited by: Grant Bennet-Alder