HH Scott 222c. or Lebem 300SX
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2nd to HH Scott. It's one of the most advanced tube amps and it's a sleeper that is very hard to beat with much more pricier amps. For horns it has one of the most advanced noise filtering and management. The cons on HH Scott amps is hard to find parts and they're not cheap if unit needs service. Sometimes you have to cut larger holes in the chassis to install available filter caps.
How much do you want spend? I think if you want to stay with a moderately priced amp, a new Cambridge Audio Azur 651A or a NAD C356BEE would sound really nice with your Heresy's.
On the cheap used side, many 80's and 90's Denon integrated amps sound really good with Heresy's as well as fortes and Quartet's. I am currently using a Denon PMA-757(80w/ch) with my Heresy's and a 90's Onkyo Integra A9711(80w/ch) with my Heresy II's. Very punchy midbass and pretty dead on neutral.
This review of the Rega Brio-R matched the amp with Klipsch Heresey IIIs to good effect. It also has a very low noise floor, which is essential for an amp powering very sensitive speakers. The PrimaLuna One mentioned in the review sounds like it would be a good match. And another affordable integrated with a freakishly low noise floor is the Marantz PM8004. The s/n spec on the amp section is 125 dB.
Again - the Heresys are extremely efficient which gives you a great opportunity to play around with some low-watt tube amps including but not limited to SETs, which will give a far more detailed, engaging and magical sound than any hulking solid-state McIntosh will give you - especially if you're willing to shell out what an MA6300 would cost.
Mating a SS Mac amp with Heresys is like mating King Kong with Fay Wray.
Look into Almarro, Decware, Miniwatt, Bottlehead, or the vintage Scott that was mentioned, a nice Eico HF-81, etc.