3-4 users on this thread said that Norton (products) is good Antivirus. Omg guys srsly, okey avast is best free av, but if you try Norton AV or Norton IS 2012 or 2013 you will be really impressed of the norton lightness. Norton even can be more light than Avast av if you configure good. I use IS 2013 - and i am 2 years with norton products. Before i used Avast av on my old pc.
I'm also using it, great choice. Its normal price is $54.99. It has got "Award-winning virus protection"
No one antivirus is perfect. They have different virus database. I am using international antivirus and local antivirus.