We just cleaned up our network layout, and put in a new reduntant server (not shown in the diagram), because the redundand server needs to be manually connected to bring it up.
The server runs ubuntu, with squid for proxy server, samba for file server, and it also doubles as a login server for other linux machines.
The wireless switch/router is placed behind the server, so even it goes through the squid proxy.
A major advantage of using ubuntu for our workstations, we have not experienced even one breakdown. (no virus too).
The daily backup machine is not actually a server, but HDD mounted on USB, we just run a cron everyday to backup the server.
We have atom processor powering our workstations, that keeps the costing factor real low. And no CD drives on the workstations except a few. (who uses cd/dvd's anyways).
Kudos to opensource, we can spend more on technology rather than on infrastructure.

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