I'm using a Nad M3 to power my 400 mk1's and am stunned by the results. I demo'd the 400's on some McIntosh amps (not sure of the models) and quite frankly the Nad ranks right up there.
I find that the Nad M3/Dali Helikon 400 mk1 combo very warm and natural, but did feel I needed to upgrade my cd player (Rega Planet) in order to achieve that "live" sound that I dream of. I now have an Esoteric sa-60 source and am thrilled with the results: natural, warm, and life-like. Not true "live" sound, but pretty darn close.
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