Nuforce Ref 9SE V2. But be prepared for the revelation of imbalance from upstream components and cablings. Read up more on their website as these seems to fit your requirement to a "T". One of the e-zine reviewers (Audiophilia) replaced his ESL/Innersound 330 with these as reference. Many other reviewers have done the same replacing this mono-block pair as their reference.
Good luck,
Kenobi
Good luck,
Kenobi