I must say None of the above

NOD32 by Eset is far and above the best of the best. Yes I agree AVG is good as well as Avast. PC-Cillin used to be good but now it is garbage. I have been playing with the New McAfee 2007 which is pretty decent and also Panda 2007 is pretty good as well. NAV 07 is once again a flaming pile of trash much like their software since 2004. BitDefender and Sophos are really good too. I have one PC that I infect with viruses and I use different AV products and see which one can remove certain new viruses such as Ruin and whatnot.

MIT does a virus research project every year or maybe a couple times a year now that I think about it and for the past 7 years they have ranked NOD32 at the top of the list with Sophos right behind it.