razor5cl, I bought the EPH100 before I picked up the DNK. I ended up returning the Yamahas. The EPH100's were pretty good, but the DNK is just better in almost every way. I would say the Yamahas have a slight edge in comfort, though the DNK isn't uncomfortable in my opinion. The DNK's just sound so much better that it is no contest as far as I am concerned. Hope that helps!
Thanks for your help. My second pair of EPH-100s broke on me last week, but apart from that I really love them. The main reason I'd like to get a second(good) pair of IEMs is in case the other pair breaks or gets lost, etc. And also because I'd heard a lot of good things about the DN1K, I was being increasingly drawn in.