I'm going to agree with the Kerio there. I've been using it and it's been a great secondary firewall, next to my netgear router. Kerio has let me see what is trying to get out of my computer, and what is coming inside. Heck, it's stopped some random named file from connecting to the internet. Let's just say after I discovered this, I locked the computer down, til I ran everything...AV and Spybot.
Even the free version gives you a ton of options to work with.
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