Integrated amp for Joseph Audio Pulsars

I'd be grateful for recommendations on a suitable integrated amp to match Joseph Audio's Pulsar speakers. They are currently being driven by a Musical Fidelity M6i integrated but am looking for more punch and finesse.

Would MBL's Corona C51 integrated represent a big step forward? Or perhaps the new Krell? Budget is US$6,000. Thanks in advance.

PS space constraints dictate that it has to be an integrated