I'm not an expert on this stuff yet so forgive my lack of terminology:
I listen to a ton of soundtracks (Hans Zimmer/Inception/Dark Knight) and love Trance music. I love listening to music when it feels as though I'm actually there (all the different instruments or sounds are separated and feel like they're surrounding me).
I love, absolutely love, rich and powerful - but natural - sounding bass (I always refer to my younger years being in my father's escalade with the Bose Sound system which had incredible bass).
I can say that I initially purchased Shure 535's and found them to be terrible - they just sounded artificial. I found the UE 900's better than the Shure 535's by a wide margin, and ended up with loving the Westone 4R's the most (provided I stuck them far enough in my ears lol).
I sampled the AKG K3003I's and found them to also be terrible compared to the Westone's or UE's.
I'd love a pair of headphones that allows me to hear everything in its most natural, and powerful form - and to allow me to forget I'm wearing headphones but instead feel like the music's going on in my head...?
-- Note: I cannot stand using the foam/expanding (or isolating) tips because they don't make the headphones sound as powerful/rich/bass surrounding as when I use the rubber tips. Not sure if that's relevant (but if I had no choice but to use expanding/foam tips, I'd have returned all of my expensive headphones and stuck with my Bose In Ears).
Thank you all so much for helping with this potentially expensive decision!