Here ya go ZB do your own assessments: You will see that everyone has their favorite so it becomes a personal choice. I use Avast or Avira in conjunction with Malwarebites, all are free and all do just as good a job as the ones you have to buy.
Best Free Antivirus Software
Best Antivirus 10 Top Antivirus Best 2011
Top Standalone Antivirus Software for 2010 - PCWorld
Best Free Antivirus Software
Best Antivirus 10 Top Antivirus Best 2011
Top Standalone Antivirus Software for 2010 - PCWorld