IT/computer guys: Best antivirus/firewall?

[DRJDVM's '69]

I wanted to get some "expert" opinions on Antivirus/Firewall software...

I've used Norton Internet Security for as long as I can remember.... probably a good 10 years now. Bottom line is its a huge performance hog and I'm sick of it. I've kinda heard/known this for years but stuck with it out of habit. The subscription is up, and I'm looking to change.

So.....in you opinion what is the best protection for my computer?

I have an XP based Dell desktop and a laptop

Cable internet run through a router....wireless connection to laptop and PS3

Some suggestions I've gotten...

(1) Just used the Microsoft firewall and the router is a built in firewall too...no need for an additonal firewall.

(2) Antivirus/spyware etc...use Webroot Spysweeper or Kaspersky

Now my online research seems to say NIS 2009 is way way better, less CPU hogging etc, but I'm always wary of alot of the online reviews at some of the sites

So..any "real world" opinions ?