From your list, all that I see are great except bit which I do not know.
I suggest that you use
AVG Free though. It is the best in my opinion for killing viruses (second place goes to McAfee)
For a firewall, Zone Alarm Free or Sygate (I can't vouche for Sygate, but I have heard good things. Big thumbs up on ZoneAlarm).
For anti-spyware get Spybot AND AdAware SE (both free). What one misses the other is sure to pick up.
If you will not use these for some strange reason, you can get Windows Anti Spyware (BETA).
Note: I think that Windows AntiSpyware was renamed recently. You may wish to Google it.