I have multiple protection programs, which ones do I keep?

Hi, I have a few protection programs installed in my computer. I have NOD32, spyware terminator, AVG anti-spyware, and spybot. I think NOD32 overlaps antivirus with AVG. I kept realtime protection off for all but NOD32 antivirus. I was wondering if I need anything else besides a spyware. Which ones do I keep? Which ones might conflict? I want to conserve computer resources.

Also, I use firefox browser with Adblock plus plugin, I have a router that provides limited firewall. I also Peerguardian and Protowall installed which loads blacklists to block known bad IPs. I need both programs for different lists. On top of that, I have comodo firewall, which I feel like I dont need. DO I? I disabled the application monitor because I have never had an issue with trojans and viruses and because I'm conditioned to accept every warning box I so it does me to good to have the window up. With the application monitor gone, all I have left is the network monitor which is just duplicating the work done by the router.

Explain the options please. My goal is to just have the NOD32, a spyware checker, the IP filters, and the router firewall. Why have more?