I used to have a pair of Triangle Comete ES and can say they are excellent with McIntosh. I have a MC240 tube amp that I never got to use with the Cometes but I am familiar enough with both to say it will be sublime. Actually, I think Naias would work better with my 240 than my Electra 926s do. The 926s are very neutral and so the 240 sounds a tiny bit soft. But the EQ on my C42 solved that problem (the 275 is known for better neutrality). You will not regret the Mc system at all - it will be huge improvement and the Naias will relish it to no end. Fantastic choice/idea IMO. I would love to hear it.
Arthur
Arthur