Whoa there, Glenn...
While a virus on Mac is POSSIBLE, they are extreemely rare. I use mostly FreeBSD machines, but have a mac powerbook on my desk too. My wife has been using high end Mac boxes and BSD boxes of various varieties side-by-side for over a decade for 3d graphics, animation etc. My daughter, now in high school, also uses mac and Unix, and has done for most of her life.
None of us use antivirus products on these machines, and never have. We are all directly connected, 24/7, on 6 megabit, low-latency links, and none of the machines have ever had an issue.
That said, in the office we "have to" run windoze on the public access machines. They are loaded up to the back teeth with anti-spyware, anti-virus, anti-malware, anti-trojan software up the wazoo, yet they STILL need reformatted and reloaded periodically because something "gets through".
I agree, use what suits, but please, don't "bag out" anything thats not microsoft just because its not your personal favourite.
As you say, lets leave that stuff for other (more appropriate) forums, and concentrate on the "relevant" stuff that brings us all together here.