I've been hearing many great things about NOD32, that it uses the fewest resources and protects the most out of all of the anti-virus programs out there.

I'm running AVG 7.5 free right now, and my computer seems to be fine. I have the Windows Firewall and a router firewall, along with Firefox with security extensions for safer browsing.

So even though everything seems to be ok, should I make the switch, or just wait till AVG gets stumped?

it is one of the best av programmes in the world. also a super fast scan.

There is an old saying here at BC which says : If it ain't broken, don't fix it
AVG Free is recommended overhere because of it's interface. basicly there are as many opinions as there are antivirus programs. You mentioned that you are using the windows firewall which is only "half a protection " I use , in cojunction with AVG Free, Zone Alarm firewall ( see my sig) and it has kept me clean.By using Zone Alarm you can shut down your router firewall and windows since it is already a bad idea to run 2 firewalls

Im also thinking getting Nod32,I tried it before but had to switch with a new one since i got a new laptop
it has faster scanning,less resources and less positives the only thing is,you can get the product as its fullest when buying it