I think you're overkilling your computer... maybe, only maybe, the spyware protection is needed side-by-side with avast.
Yeah, you're probably correct. But my environment is stable and in this day and age, it's better to be too careful. Besides, my setup is nothing compared to other users I've seen on forums that run every av/spy-malware app you can imagine. Which leads me to believe they are all really well behaved, or they do nothing at all. Hmmmmmm...
Anyhow, I dropped Spyware Terminator. Way too intrusive and unstable. No matter what I did or how I configured the darn thing, at some point in time it would begin challenging me to allow/block avast!, Firefox and, among others, Explorer (the shell, not IE) and then every dll, ocx, etc associated with them. In the end there were dozens of entries in the allow listing. However, the ClamAV module worked well and didn't step on avast! Too bad, as it's bye bye Spyware Terminator.
Threatfire has confirmed they are testing a build to address their conflict with avast!'s Web Shield provider. As of this moment, 4.0.0.8 is still the current version pushed. TF was the only app that alerted "whatever.exe is attempting to access the Internet in a suspicious manner" and I miss that functionality since it eliminated the need for a "real" software firewall. (No one makes a simple outbound rules firewall anymore.) I am sincerely hoping their next release will work smoothly with avast!.
While avast! Pro remains my front line defense, I am firmly convinced that Comodo's BOClean and Memory Firewall protect areas that avast does not. And I am currently testing PC Tools' Spyware Doctor. Unless some one can provide forensic evidence that these aren't necessary, I'll continue to run them.
Cheers!