Kespersky is good, but I find the scanning process way slow, Norton internet security is a full featured with impressive user interface, but it doesn't allow to choose actions when a threat is detected, and Completely deletes it, not even quarantines it ! So, if you are a advance user, you know what is what ! Avast! is good, but the paid one "Internet security" it has useful new features as well.
So, Avast and Kespersky is good, Go for Norton if you keeps your PC according to so called completely safe rules.