Hi,
I have dealer friend out here who stocks both marantz and Nad.If you are looking out for more power without losing out on the finesse and subtle nuances of sound and you are on a budget, you could try out the new NAD C372.I heard it last week.It is a 150 watt per channel@8ohm amp and it rocks! It is a high current model and can drive virtually any loudspeaker with ease.