A stereo set-up if done properly is capable of reproducing 3D sound. I will not worry too much about centre and rears. Yes, if you must, perhaps getting 3 more special will be great.
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I have Dynaudio Contour SC match my Special 25s. Wonderful tonal match and openness! Beat my previous PSB and Dunlavy center channel speakers hands down. Don't go anything less. I dilligently tested SC and Special 25s in TV dialogue and music, SC it a must to have. Trust me.
Rear surround speakers are complete different story. They are just for 'effect' not music itself. I am very happy with my PSB Alpha Mini ($179/pair). Don't waste money on them.
The difference between with and without Center Speaker can be very subtle indeed in lots of cases. But in full DD or DTS mode, center speaker does anchor the image more solid, especially for dialogues. The Dolby ProLogic IIx also performs better with center speaker, at lease in my set up which consists of Yamaha RX-V1400 receiver and Dynaudio Special 25s mains and Contour SC center channel.
But I could be wrong though since there are so many different channel setup options such as redirect center channel to the two mains which I have not explored, instead I simply disconnected the center. Maybe with right configuration two main will do an adequate job.......