Im using ESET as anti virus, i have tested allmost all anti viruses but i like ESET the most. And i feel like they are faster on updating then other anti viruses. Then i FUD crypt my files ESET is the first one to see it. Then other anti virues takes time to find it, maby even weeks.
But i have had some problems whit ESET aswell. Sometime they just have to good security, i had problems at LAN's at finding lan servers etc, but no big problems.
The best ones is:
ESET Smart Security / NORD32
Avast - Dont buy premium its bullshit enyways. Anti malware is good