Center channel here also. I started in stereo with just the Kef 107's. The XQ2c is a good match and meshes well with the midrange/high frequency of the mains.

By the way; shielding on the speakers is only necessary for a CRT display and I see you're using a plasma. These aren't affected by the stray magnetic fields of a speaker.

Experiment: Take a strong magnet (one from an old disk drive is ideal) and, from about 3 feet away, approach a CRT display slowly. Notice the color distortion as the magnet approaches. Be careful not to approach too closely, as it is quite possible to magnetize the grid behind the screen, leaving semi-permanent color distortions. On a old black and white set this is not a problem and you can safely induce huge distortions in the picture.

Repeat for a flat panel or rear projection. No effect, as there's no electron beam to distort.