All I have ever used for portable audio players are iPods. I have an iPod touch(32gb) and an iPod classic(160gb) and I use various IEM's(mainly J3-Buds) and Audio Technica M-50 Studio Headphones with these players. I want to move on to less restricted and higher quality players. I'm looking...

I was recommended to get some headphones from sennheiser and I've heard mixed reviews about the sound output, things like dampened sound, too bright, and too high impedance. I would primarily use it with an iPod for personal use and I'm not sure it has enough power to get the most quality out of...