Avast premier, ESET Smart Security, Comodo Internet Security Premium, or any other antivirus product? Please explain why.
+1Eset is the only paid product that I would recommend to users who want to pay.
Most users do not want to pay, therefore I recommend Avast free, Avira free, AVG free, Microsoft Security Essentials (Windows Defender On Win8) and Panda Cloud free.
No security product can protect reckless users therefore they will just waste money paying for a product, they might as well just use a free product.