AVG was great many years ago, but for donkey's years I've been using Avast, the free version and I've never been hit successfully by anything.
I think Norton's and McAfee... hmm... I'm trying to think of something bad to call them, but I can't think of anything bad enough...
Malwarebytes is great for getting rid of infestations, and if you really want to get heavy with something there is Hijakthis, and combifix... but they're more useful when dealing with the fallout of an attack.
Just be a nutter... life becomes much more exciting, and people won't expect anything more of you...