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I've seen some threads regarding recommended headphone amps. for the HE-500, but no mention of the now discontinued GCHA being used by anyone with a HE-500. I'm guessing if I buy the HE-500 I'm going to have to eventually upgrade my current amplifier that works well with my Sennheiser HD-650's. I'd like to upgrade one piece of equipment at a time. Maybe it would make more sense to upgrade the amp. first and live with the HD-650 until I can add the HiFiman?