Which amplifier

I would pair a less warm amp with the Cornwalls, which are a bit warm on their own.  I’d go with the Accuphase.

I completely agree with @faustuss I have both of these amplifiers and I can confirm that they have too much power for Klipsch speakers, if you do not want to change speakers then I highly recommend Luxman SQ-N150 which is perfect for your speakers and has very good MM and MC phono input.

I own Mac amp and pre, but damn that Accuphase kit is pretty! 

@andu Voice of reason!

If you're considering integrated amplifiers in this range, the McIntosh MA8000 is a standout. It delivers 300W per channel, ensuring ample headroom for most speakers. Its built-in DAC and phono stage add versatility, and the signature McIntosh sound—warm, detailed, and engaging—makes it a compelling choice. While the Accuphase E-470 is also excellent, the MA8000's combination of power and features might align better with your needs. If you have the opportunity, auditioning both could provide clarity.