Portability is pretty important to me, I got a good deal on the turbine pro coppers so I bought them, but since returned them because a factory defects... Something with a lot of clarity, deep but controlled bass and good highs. I'm not exactly sure how much more specific I can be.

The first "expensive" pair of headphones I bought were the upgraded apple in-ears (w/ dual drivers). Those were by far the best headphones I have owned, but that was two years ago. I am now looking for an affordable upgrade, preferably less than $200. I like detail and spaciousness.