smAsh
Forerunner
Avast anyday. I am using avast since past 1.5 year and it is the best antivirus I have ever used in past 10 years. It is stable, it has good detection rate, it gives no false warnings like avira does. Although it is a lil bit slow but I can live with that. KAV and NOD32 are good too but my choice is Avast.