Travel Technology - Corporate antivirus recommendations?

I've purchased and installed (and been happy with) Symantec AV Corp. Edition for dozens of my clients, up through v10.2, but the new Symantec Endpoint Security v11 has been an absolute nightmare in two of my client installations, and I've read scads of horror stories on various websites.

I basically need recommendations for centralized server & desktop virus protection for businesses that range from 10 to 100 users - and I have lots of clients in this category. Most do not have IT staff, and they and I have always liked that I can configure the software on the server, roll it out to the clients, and the only thing the client has to do is pay the annual renewal fees.

Symantec decided to switch from basic antivirus with it's corporate product to some browser-based behemoth that tries to take care of trojans, spam, spyware, and tons of other stuff that we've already got covered with other products. Rampant problems reported by users include loss of network drive mapping on the desktops and eating up 4-6 GB in temporary files in a single day.

Trend Micro has also gone this direction in its NeatSuite for SMB, and it seems also to be a major bit of bloatware.

I haven't considered McAfee's enterprise solutions for years, as they formerly had problems with some of our applications. Plus, their desktop stuff is annoying and slow.

Any thoughts for centralized small business antivirus products?

Sophos! Sophos! Sophos! http://www.sophos.com/

It's easy to manage, service and support is outstanding, the client is available for a whole slew of operating systems, and their pricing is by node, regardless of if it's a desktop or a server. Last year I was in charge of 1000+ computers running McAfee. I switched them all over to Sophos without a hitch and didn't look back (esp after I switched jobs).