I have to say (knock wood) that I have been having really good results, maybe two years worth, from Avast.
I don't know what nasty site I visited last week, but my weekly Sunday Avast scan turned up 343 (!!!) files infected with "Win32-Adloader AZ (trj)" Avast allowed me to send all the little boogers to the Chest. Thanks.
Does anyone have any info on this Trojan?