Never heard of Sophos?? Do not tell your customers that, they will lose whatever confidence they have in you right there and then!!
As much as people bash it I do still quite like McAfee managed by ePO, never had a problem with it here or at my previous work.
If I were to go somewhere else tomorrow and someone said pick us some AV I'd probably pick McAfee or Sophos tbh, as good as ESET is there's just something that niggles with me for using it for a large number of machines. I do currently use it for a handful (talking about 5) machines in a corporate environment.
Ooh forgot we're also using some Panda web managed AV for a project we're providing the IT infrastructure for, seems alright but again wouldn't want to use it for a large corporate estate.