I also own the concept 500. I paired them with Mcintosh Ma252 and Moon 600i.
Since the 600i is a fantastic amplifier, it sounds better than the Mcintosh gear by far.
Been said that, you could try a used 600i but I’m afraid it will be out of your price range.
You could try a used Marantz PM11S3, which I liked more than Marantz Ruby or PM10.
Another option that can surprise you is a Gato Audio DIA-250S from Denmark, which now is 40% off factory direct with shipping and taxes included for 2.495 euros. One hell of an integrated more close to the high end amplifiers that you can imagine, and with DAC included that sounds like a 2.000 euros one. I have no affiliation with them, just like their gear. I will try this combination with Concept 500 shortly.
Since the 600i is a fantastic amplifier, it sounds better than the Mcintosh gear by far.
Been said that, you could try a used 600i but I’m afraid it will be out of your price range.
You could try a used Marantz PM11S3, which I liked more than Marantz Ruby or PM10.
Another option that can surprise you is a Gato Audio DIA-250S from Denmark, which now is 40% off factory direct with shipping and taxes included for 2.495 euros. One hell of an integrated more close to the high end amplifiers that you can imagine, and with DAC included that sounds like a 2.000 euros one. I have no affiliation with them, just like their gear. I will try this combination with Concept 500 shortly.