mcintosh ma 6600 vs rega osiris vs nad m2

I have just received the combo Isis + Osiris. Even being on burn-in process, I can confirm that it is just an amazing amplifier. I have already heard the Mcintosh and Nad and, for me, the Osiris is in another league. My previously set was a Gryphon Callisto 2200 Integrated amplifier and Gryphon CDP1. I had the chance of comparing the Osiris to Gryphon Callisto 2200 ( for me still one of the best integrated ever ) and I can assure that the Osiris is at least on the same level ( the Callisto has a bass extension and speed difficult to be match )but the Osiris has a "magical" sound..should be heard. It has an enormous sound stage and very transparent ...very, very smooth sound. Long listening session without fatiguing.. I am very happy with my purchase.

Actually, the Osiris was the big surprise for me in this combination. I was expecting that the Isis would be great ( and it is fantastic ), however, I was not prepared by how excelente the Osiris is. For me, it is one of new references in the market concerning integrated amplifier.

I am testing the Osiris and Isis with the original Power Cable and the XLR connector from Rega. I am comparing them with Shunyata Anaconda and Furutech Reference III Power Cords and XLR VDH MC Gold. Sometimes, I feel that the more expensive cable set ( shunyata, fututech, VDH ) has more bass extension and body...but lacks the magic and transparency of the Rega´s cables..frankly speaking, I am in doubt about what better combination is...any experience ? Who has tested this Rega´s Combo used which cables ?