Most of McAfee's protection services are geared towards small businesses; however, their latest version of the Total Protection Service scales to larger node counts. You can sign up for a trial of the 5.0 service here http://www.mcafee.com/us/enterprise/products/demos/quick_tips/tops_trial.html. I believe this is outdated but here is a comparison chart between buying the technologies and leveraging their service.
Hope this helps.
Team McAfee at Ciphent
Thanks for the rapid reply, Ciphent.
We DO have TPS already installed on about 95 desktops and servers, but we're not very happy with it. I'm looking for a detailed product comparison between TPS 5.0 and Enterprise AntiVirus 8.7i
The chart you sent is good in that it alerted us to the different flavours of TPS.