Another vote for BitDefender. Not sure if its the standard package but the one im running does spyware, firewall and anti-virus.

Nice an unobtrusive once its set up and so far (6 months-ish) has done the job.

I currently have norton 360. Very nice piece of software, if you like all-in-one stuff (I do;)).

I have run Bitdefender and NOD32 and am now trying Avira
on one machine. Bitdefender is fine but a bit annoying sometimes, NOD32 has always been good and give no hassels, Avira has so far been fine but I have only used it less than a month yet so it is hard to tell.

Symantec Antivirus

Autoupdates, unobtrusive.  Doesnt ask you every 5 seconds what it should do.

I hate McAfee Secuity Centre with a passion.