Hi Steve,
Thank you very much for the pointers. Smoothwall looks like a great little product. Unfortunately, my old PC (most appropriate for Smoothwall) is a SCSI system and SCSI isn't supported yet (and doesn't seem to be a high priority).
The D-Link DI-704 looks like a great box. And only $84! That seems to be the way to go for my needs.
Thanks to you and Andrew for the pointers and comments. I greatly appreciate it.
Cheers,
Scott.