Thanks for all the comments. The um3x sound exactly like what I want in the imaging department. Regarding the bass though, does it render sub bass pretty well? I appreciate bass rumble much more than bass impact. And by being accurate, does that mean it become bass heavy with bass heavy music? Or will I feel unfulfilled with music that revolves around the sub bass. I absolutely love the way my ER4Ps image songs, and sometimes I'm even quite surprised by their fast, accurate bass. But when I listen to songs with rumbling bass lines, I feel like getting new headphones.
The soundstage is of a more accurate size from a performers perspective (for some venues) but from a concert viewer perspective, it is somewhat closed in from left to right. However it has very good depth. I don't mind it though, as it does everything else so well.
I wouldn't prescribe larger soundstages as artificial. It's just a matter of perspective.
Hey Shane, how would you compare the ASG-1s with the um3x? Because those new Aurosonics really intruige me. Especially the price point. From what I've read, they can image almostas well as the um3x, but are a bit better in the bass department.