Pass Labs XA60.5 or the XA100.5 would be my choice.
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Banpuku, I have been using the Pathos Classic One MkIII integrateds in Mono config., the VAC Phi 200 (two in Mono mode), and one other under review.
Your room is approximately the size of Kevin Hayes' room of VAC who runs the King. I would probably try it if my room was that size. But you might have to work with room treatments a lot.