I have the M300s and I believe your S2000 is for the most part two of those in one chassis.
There are many bridged differential designs such as McCormack's DNA-500 and all of his SMc modded amplifiers that are converted to monoblocks, Cary's 500 series amplifiers, Bryston's big amps, I believe the PS Audio BHK Signature 300 monos, and many more. Most of these are specified to double power from 8 to 4 ohms but most are not as comfortable driving loads below about 4 ohms. As a side question, are you sure Wilson is not using two of his S100 amplifiers in each monoblock?
There are many bridged differential designs such as McCormack's DNA-500 and all of his SMc modded amplifiers that are converted to monoblocks, Cary's 500 series amplifiers, Bryston's big amps, I believe the PS Audio BHK Signature 300 monos, and many more. Most of these are specified to double power from 8 to 4 ohms but most are not as comfortable driving loads below about 4 ohms. As a side question, are you sure Wilson is not using two of his S100 amplifiers in each monoblock?