Anti virus – need some feed back

Hi,

I need some feedback/input on anti virus software for our network. The network consist of 2 servers and 15 clients. I am deciding on the following anti virus products and which one would you recommend?

– Symantec Antivirus 7.6 Corp. Edition
– Trend Micro’s Office Scan
– Trend Micro’s ServerProtect

There are hardly any reviews done on the Trend Micro’s products, so any feedbacks about them are appreciated.