kaspersky internet security 2011 2nd comes eset smart security..kaspersky will slow down ur pc a bit and eset wont..if u have a faster pc go for the kaspersky or then eset
Well there are quit a few which i recommended.
To buy:
Kaspesky
Avast Pro
Norton
Microsoft Internet Security
Free:
Avast Free Edition
Bit Defender
Avira
Google it to find more.