Free BSD is not one of supported flavours of UNIX. I'm no expert in that domain, but I would imagine that its possible to make it work, but it might not be worth it.
It might be a better idea to go with Linux. I've used Pro on a client's Red Hat workstation and it was quite a bit quicker than my windows machine with more or less the same hardware. The only problem with UNIX and Linux is that you either need to be well versed in the OS's or have someone at work who is. I remember having a problem when it came time to plot, as the setup I was using required me to make *.ps files and send them to the printer using command-line arguments. Luckily the IT guy was down the hall so I had him show me what to do....
Do you have other Windows machines in house? The NC/Post operation should not be a very compute intensive process. It should run on any Windows machine.
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