Which one of these Anti-Virus Software should I use? (10/30/10)?

Any antivirus software is still going to allow vulnerabilities. Nothing is 100%. However, I have used Avast! home edition on my home network for many years now and it is what I put on all of my customers' computers as well as the refurbs I sell. I use it in conjunction with Malwarebytes' Antimalware and it is rare for me to have any problems whatsoever.