I'm puzzled why the King must unleash more than 500 but less than 1000 Watts (measured how?) and even more why it must be solid state. But as it went with Kings, with the possible exception of the first four Caliphs, they either bullied themselves in (and you can have many of those at the same time) or a very select electorate of king-makers has defined the rules (and thus exclude whatever they exclude for whatever reason).
Oh well, under those circumstances here are a few Kings
AMP Mono MkII (AVM) King into 8 Ohms with Electrocompaniet Nemo as Antiking perhaps
Kharma Exquisite M 1000 King into 4 Ohms
Tidal Impact Mono King into 2 Ohms (now, if I were the Pope, I'd elect this king to be the Emperor)