Exchange 2003 AntiVirus Suite Comparison?

[inukman]

I am looking at setting up an exchange 2003 server and I am wondering what is the best stand alone AV suite to use. I am looking for a good comparison between Mcafee Groupshield, TrendMicro Scanmail, and Symantec Mail Security. If anyone knows of a posted comparison or has comments on either of the mentioned product it would be greatly appreciated.