Sigh. I'm back here, again. I just can't stay away.
I currently own the closed Ultrasone PRO 550, and the in-ear Shure SE215. I love both of these.
But sometimes, I want to listen to something open. And apparently, I think I can afford the luxury of having different headphones for my every mood. The holidays are coming up, that's literally my only justification here.
In terms of open I currently own the Sennheiser PMX 90, which is decent (ish) but kind of week sounding and, while it's low end is punchy it doesn't have much strength or depth. The sound stage also isn't terribly impressive, considering they're open (and from what I gather, opens have better soundstage than closed).
I love the sound profiles on my Ultrasones and my Shures, they tend to be in the same "family" in terms of sound (if that makes any sense). I listen to rock, alternative, some pop, some R&B, classic rock, and then bits and pieces of almost everything else. I don't really want to spend more than $150 (I'd rather spend less), but I'll spend more than $70. Comfort is important, as that's one place where my PMX 90 really excels (I have them on now and barely notice them). I like a balanced overall sound, but still with some strong bass (which is the sound profile of my IEMs and my closed, in my opinion). And a good soundstage, as I feel like that and comfort are the two main advantages of open headphones.
Suggestions? I've looked into Grado and Sennheiser and Denon and Sony and Audio Technica, but particularly in this area there are just too many things for me to even get a base group of possibilities.
Many thanks for the help, I'm off to mourn my wallet now 
