Avast! Internet Security (I know it isn't free, but someone I know absolutely loves it, and said they'd get a copy for us. I'm concerned about how effective it is in regards to it's firewall, phishing, etc. though.
Microsoft Security Essentials Yes, I know it's Microsoft. I'm just curious if it's alright to use it along with the other Security Center programs as a base layer of protection up underneath the main security software I will eventually install, and it not conflict.
PC Tools Firewall Plus I'm curious about how good it is since it supposedly has a small footprint on resources.
Comodo Firewall I've been hearing it's the best free firewall around, if maybe a little heavier on resources and a bit talkative.
I'm rather paranoid when it comes to this subject, so I'm looking for what will work the best/best together. Like Avast! AV with Comodo, or don't use MSE because of this or that, etc.