In my opinion the Classe can be quickly dismissed. The Marsh has a very transparent & refined sound, truely an audiophile grade amp. However it doesn't do very well with a low impedance load (4ohms). It will drive a 4 ohm load to moderate levels but beyond that it will clip. On the other hand, the McCormack DNA-1 Deluxe is a power house and will drive virtually any load to high levels, however in its existing state it lacks refinements. If you can find one that has a Rev B or Rev A it will take care of this problem. Interestingly enough if you can get by with a lowered powered McCormack, the standard DNA 0.5 Deluxe is already very transparent and refined without revisions.