I'm not familiar with the Dunu DN-1000's. People are saying nice things about them, but frankly I'm not sure how reliable head-fi reviews are anymore. Some of the headphones I like get raves reviews there, but I've heard at least one pair of headphones that gets raves reviews at Head-Fi where I thought they sounded absolutely horrible. Maybe buy from a seller who has a liberal return policy so if you don't like them you can return them?
I admit I'm out of the loop with good review sites for headphones. I originally found the suggestion to go with the Dunu DN-1000's on a different blog site when searching for HiFiMAN RE-600s reviews. That individual actually didn't like the RE-600s when compared to the Dunu's and a couple others. I realize it's all subjective but wanted to see if you had any experience with them (which I realize you do not). Sounds like I'll just need to try a pair and find out for myself from a place with a liberal return policy like you suggested.