[Full-Disclosure] Antivirus Software Solutions?

[Nick Price]

I'm looking for two pieces of Antivirus software. The first I would like 
to filter viruses at the NAT/Gateway itself.  The platform should be 
either Linux, BSD, Solaris, or NT.  I'm also looking for Antivirus 
software to use on each of our workstations.  We've been using Norton, 
but I'd like to know what the "experts" here suggest.

Thanks
Nick