I have been a strong supporter of Avast for many years. The main reason is because they offered a very good, clean and fast method to keeping your system safe from viruses. Unfortunately, like most security companies they have expanded to offer so much more. I say unfortunately because using these services seriously affects the performance of your computer, not to mention the overkill in security. Yes true, there will be some that do require this amount of security but in general probably not. The nice part about the Avast product however, is you can turn off the items you do not need or want and keep it just as an antivirus scanner!
Avast 2015 adds Home Network Security, SecureDNS