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None of those run in a server envirionment, they simply won't install.
I am currently using Trend ServerProtect as a demo, but they want $600 bucks for the full version!! >>
I use Kaspersky Antivirus.
http://www.kaspersky.com
1. It is available for ANY platform. It can scan Exchange Mailboxes and mail on linux
2. BEST antivirus so far. The only virus properly detected I love you.
3. A lot of nice features. Automatic update (install and forget it). I set up so it sends warning on my cell phone if it finds anything.
4. It will NOT allow stupid user to run infected files under any circumstances.
5. It can monitor if any files were changed using special algorithm.
6. It is WAY faster and more powerful then any other antivirus on the market.
7. Much fatser updates for new type viruses/
Just to make it short for you. I installed it over a year ago on all workstations in our office. NO VIRUSES could spread since then, even though we receive a lot them in the email.
EDIT: NAV2001/2002 simply sucks. Mcafee is better but not as good as AVP.
Real world example: Sircam. Mcaffe couldn't detect or stop it (we have it on our campus, so I can compare). AVP detected it and protected my users from it - no problems.