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The NightHawks are dark headphones, just imagine your HD-600 with less treble presence.
I myself haven't upgraded/bought anything after getting HE-500. I have tested a whole lot of headphones though but I have settled on a pair that perfectly matches my preferences. Since you already have the HE-400i and HD-600, the only thing you should do is understand your preferences first then make a decision whether or not you want to get a new set of headphones based on that preference. Also, join or take part in meets to try out other headphones, especially ones that you would consider "high-end"