Im not going to weigh in on what's best or worst, but in relation to cost - 3 ideas if you are in US.
1) Watch the sunday papers for rebate specials on McAfee and/or Symantec products then ask the office staff to help out by each one buying one and submitting rebate paper work.
(Church could advance money to be refunded by employee when rebate received.)
2) Check out major on-line auctions-suspect you can buy cheaper there-also keep in mind that McAfee and Symantec include virus protection in some utility packages-in some cases you might find utility package cheaper than just virus package.
3) I do not have technical background to be absolutely certain of next comment, but I'd think you could go back at least one year in the product line (ie 2002 versions instead of 2003 versions) without major loss of functionality. This would probably also save you money on purchase price. You could then make somekind of rotating update plan so you didn't have to buy brand new software for every system every year.
In terms of updating, Symantec and McAfee both used to provide downloadable definition files that did not require subscription payments.
This does place the responsibility of downloading and applying updates on the individual users-if the head pastor would support you in this, you could basically say this is the best stewardship approach we can come up with and if you cannot help us by doing the updates in a responsible manner, we can no longer let you have access to internet.
If you need to check the machines now prior to making purchases of something, you can do on-line scans -- sites are referenced in other posts, or if you post back with the specific question-others that know those sites can tell you what they are.
