May I refer you to this link; http://www.head-fi.org/forum/thread/541204/concise-multi-iem-comparison-future-sonics-atrio-m5-mg7-added-may-15th-2011 ClieOS does a great job of detailing the 4 basic sound signatures; 1). Analytical: (treble boosted, mids and bass recessed) 2). Balanced: (treble and bass boosted, mids recessed) 3). Bassy: (bass boosted, mids and treble recessed) 4). Midrange-y: (mids boosted, bass and treble recessed) (There is a 5th sound signature mentioned in his post but that is more of a composite of two of the above basic ones). I guess I'm unlike most of you guys in that I don't enjoy upgrading my equipment as much as side-grading it. I want a collection of at least decent sounding headphones with each of these sound signatures. It's just interesting to me how different they present your music and there is no best way obviously. Can you guys recommend here a list of various low-to-mid-budget portable models and full-sized models (no budget limit) that best represent each sound signature? Thanks in advance!!