We have had noting but good experiences with Barracuda Networks... Their apliances have always been top notch as well as their support and sales team. You will be blown away with the amount of blocking these things do and the accracy is next to none. The cost is quite high but well worth it.
Hope this helps in your quest.
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Just curious if you had looked at MailFoundry? We had a somewhat shaky start w/ it, but have come to really like it. Have heard some recent grumblings re Barracuda and have not used Clearswift. Will keep an eye on this thread as spam is just out of control these days.
Allen Burnett StormHosts[email protected] Professional MS ASP, .Net, MS SQL 2000/2005 and Reseller Hosting Since 2001 Clustered servers @ Equinix Helm/cPanel/WHM/VPS/colo/Dedicated/MailFoundry anti-spam/Server Mgmt