I do not have a good source for antivirus benchmarking at this time. There are several factors that I'm sure you already considered. Below is a small list:
These are only some factors to consider when reviewing antivirus vendors. As with all other systems your selection should be based on business requirements.
For more information on this topic, visit these other SearchSecurity.com resources:
Ask the Expert: Best practices for implementing antivirus software
Scheier's Security Product Roundup: Antivirus tools: Unify and conquer
Best Web Links: Malware
This was first published in July 2002