One advantage the 950 has over the Sherwood is the 950 has separate crossovers for the center, front and surround speakers. The Sherwood has a global crossover, as I understand it. But...
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I'm sure the Cirrus surround modes will do about the same job as DPLIIx.

DPL IIx is superior to Cirrus surround. Cirrus surround adds one just mono channel of sound in the rear not a stereo pair. Also as I understand it, the side surround in Cirrus surround are not modified when the rear surrounds are added. But with DPL IIx, the sides are modified to take account of the rear surrounds.