The weird thing is that I don't see any single mention of Kaspersky, it's either because you know something about it that makes it bad which I don't know or it's not that popular.
I've tried many of them including Norton, Avira, Avast, Node32 and more but to be honest I never been comfortable and pleased with the results of any on the early mentioned. Then I got a recommendation via email to try Kaspersky. I am with them since years. Give it a shot
For a home user, try KS Internet Security 2013 »www.kaspersky.com/safe?icid=bnnr···sfe_area
For business, try Kaspersky Endpoint Security for Business; Advanced »www.kaspersky.com/business-secur···advanced
Sometime I thank for using OS X for personal usage. Yes, it's not completely clean but Apple is solving such problem in free software updates. This is irrelevant but I felt like expressing