Kaspersky Internet Security is the best IMO, Ive used it for so long now. I actually pay for it. Out of every single AV program I have used being a Systems Security Tech, KIS has always come out on top. Its worth the $60 by far..
I used to use Norton but it interfered too often with basic things like game play or program installation. Then I tried AVG. AVG was okay, but kinda confusing. I am now on Avast, which is actually easier to me than AVG so far.