Currently Being ModeratedSep 19, 2012 6:37 PM (in response to nOmada)
You're already using it.
Currently Being ModeratedSep 19, 2012 7:25 PM (in response to nOmada)
There really isn't any best one, as first off Mac malware is usually rare and not all anti-virus vendors are looking for Mac malware, focused on the more profitable Windows PC market.
10.7 and 10.8 are still getting under the hood changes from Apple, so the free, run as you need it ClamXav is safer for them
10.6 is getting no under the hood changes, just fixes, so a more stringent anti-virus can be used to lock it down more, but ClamXAv is still good too as Mac malware is rare anyway.