Kaspersky Internet Security.
Thats after having trialed most of the others. Sophos were a 2nd choice but their buggy central-update software and larger system overhead ruled them out.
Used to use McAfee/Dr Sols in the old days but last time I looked they'd been overtaken by the competition.
As for symantec - I wouldnt touch any of there stuff with a bargepole!
It would appear they stopped writing good software about the same time as DOS/Windows 3.11 died and we no longer needed their tools.
I'm still keeping my fingers crossed they dont completely fuck up 'Backup Exec' having bought Veritas...