King of High Current Amps

I am wondering what is the best reasonable High Current Amp out there that is not really a simple pair of overweight boxes. I am looking for something that is among the best out there, in attempts of driving Infinity Kappa 9. Please, I am not interested in reading about ML and KRELL.
Any feedback on SIM W-5, Classes, Parasounds, Bryston etc...welcomed. Be specific in the sound, price in the used market, and actual experiences with them.

Thanks