I'd recommend trying the westone w4's. They maybe called the w40's now, I'm not up to date on the new models.
They've been my favorite for a while now. I consider them in the same grouping as the hd600 in that they are both slightly warm, non-fatiguing, and are a good jack-of-all-trades.
I believe westone releases some newer models since the w4, but I am not familiar with them.