When I had the HE-400, I got the Mini-X a few weeks prior to picking up the HE-500 so I got to trial it exclusively with the HE-400 for a bit. From my personal experience, I think it is indeed a bit overkill unless you are already planning on upgrading. You also won't have much play on the volume knob - the HE-400 is quite efficient. What are you currently using with your HE-400?
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