mcintosh ma 6600 vs rega osiris vs nad m2

I have Rega Isis and Osiris on demo at home now and to me it is an excellent sounding system.More than enough power,huge sound-stage,non fatiguing with silky midrange.Guitars and vocals never sounded better.I have to mention that part of this great sound is ISIS which could be one of the best CD players around.The sound is liquid and very involving bordering on analog.I also have listened to Mcintosh 6600,it has many nice features, but it was a little underpowered and slower with less resolution, but still a nice sounding with good sound-stage.

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 ?