Ken, I'll second Dan's suggestions. Depending on your budget and space available, consider a VP160 or vertical M22/M2 for a center. Also, consider QSs for surrounds.

Yes, CDs and other 2-channel music source materials are heard best when the surround ambience picked up by the microphones and mixed into the front channels(there was no place else to put it)is extracted by a mode such as DPLII and sent to the surrounds where it belongs.

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Enjoy the music, not the equipment.