Great guide so far!
Two programs I use that you might like to add onto the list are SpywareBlaster
as an extra layer of protection. They're both also very light on resources.
Personally, I wouldn't recommend using AVG 8.0. There are TONS of complaints about it slowing down the system or causing problems. Frankly, its better to use Avast or Avira.
I don't use a software firewall, so I can't comment on that. Most people will probably find the Windows Firewall adequate though..