There aren't very many Mac users around here, as this isn't a Mac forum. My best advice is to search some online Mac software specialists (there are quite a few around, I think) and see what they have for sale.
If you find anything and you're not sure whether it's likely to be up to scratch, ask us here. If there is a Windows equivalent from the same developer, then we can at least give our opinions on that as a rough guide. For example, those in the know tend to recommend stuff like Sygate or Zone Alarm(firewall) and AVG or Avast (antivirus). I use Sygate and Avast on one PC and the F-Secure suite on another. Avoid Symantec.