As a long time Mac user I have always felt safe not having a great deal of security software or virus software on my machines. The worst Mac virus I ever had was nVIR and frankly it wasn't that dammaging. It just piggied up the machine a bit and was pretty easy to get rid of with free virus tools that were out there. And the only way I ever got it was by using software from questionable sources. In all the years I have had a Mac on the Internet I have never gotten a virus, nor an Office virus nor anything else.

It has been said:
Hybrid drivers come in 3 flavors, greenie, techie and cheapie. Pick any 2.
2005 Prius, Melinium Silver over gray, package 5 (AI)