I spent a lot of time a few years ago shopping for a Klipsch center channel and ultimately I realized that the Polk sounded really good and I was looking at taking a quality step down on my center channel for a sonic match that I really didn't notice. When I am watching movies the front stage sounds great. For music I use the direct stereo mode with it off anyway as I like the sound of the KG 5.5's + sub.
I did the Klipsch surrounds before to have a good match, but really wasn't happy with the overall quality of the 5650s. They were ok, but not up to the standard of everything else in my system, even my wimpy sub...
Eventually I will win an auction for a sunfire sub, but this is a fine stopgap :-)
I'll look at the HTD's. Thanks!