Well I finally got around to installing Comodo Internet Security last night and I must say that on the whole I'm quite pleased with it. Apart from being a breeze to install, it seems to use few system resources, even when scanning. It did find a couple of false positives and sandbox them during the initial scan, Winstep Workshelf and Fastone Image Viewer, but upon completion this had been corrected and the apps were released to full usage again.
Yup, I like having my security tools [AV/Firewall, etc] all in one toolbox, and Comodo has done a better job of it than Norton IMHO, so I'm feeling happier and safer with it onboard. Also, it is more configurable than I remember Norton being, so I feel more in control as well... as in I can choose from "Safe" to "Proactive" modes if I want to.