Many thanks for the replies. I'd been anticipating moving the present system to another room, where there would not have been enough space to place my present rear speakers. Had been thinking I'd have to get a true surround speaker pair. It looks like the SS-1 might be a good match from what I've read. As for the center channel, it's barely a year old, but seems to do the job. Unfortunately, when I was at Tweeter, they only had two Klipsch centers, and this one sounded best (and cost more of course.)
You are right though, the Kg1.2's sound excellent, especially in this setup.
Again, thanks for the advice.
Bob