products for scanning http/ftp, and blocking malicious sites?

[David Boyer <David () BVU EDU>]

We're currently evaluating TrendMicro's Interscan Web Security Suite. We have it configured between our http proxy 
server and the internet, and it does http and ftp scanning as well as URL filter to block access to known 
phishing/malware sites. It gets antivirus and URL blacklist updates automatically?
 
Are there other products out there that do something similar? All of our clients have updated antivirus software 
installed, but we'd like the additional protection of stopping that stuff at the gateway if we can. We'd also like to 
be able to prevent users from ending up on phishing or other malware sites. 
 
Any suggestions you have are appreciated. TIA!