well, to address this from my point of view, symantec(norton) and macafee are ok as AV only, but once you start pilling on all the crap they ship out to the consumer, it's a hog and not a good one. In the corporate world, they do fine, cause they don't ship with all that crap. We use Etrust (contracted to) and symantec (parent company),and I don't have any problems with them. I use AVG at home cause it's simple and does only what I want it to when I want it to. And it doesn't cause me a headache everytime I reboot my machine. Also, I'm very fond of their 2 year soho lisensing as I have 4 machines and that covers them very well.
I know what I like and don't, so as I stated before, AVG.