The biggest single factor I have seen with Magnapans is a "thirst" for power. I would agree that headroom is more important than RMS power to a point. As I recall the load presented by this speaker is fairly resistive so amps are not as big a concern. These speakers are less sensitive to bright vs laid back sounding amps. I wouldn't consider anything rated at less than 200WPC at 8 ohms and look for more power if you can afford it.
