I used to hold the same position on soundstage. My thing was bass and then when I found everything I wanted in the lcd2... I wanted a little more soundstage. That desire snuck up on me. I am becoming wayyyy too picky.
all of it started with me trying to find a good headphone for vocals under 200
I own the LCD-2. And I love vocals; and the 7520 has beautiful vocals. Both male and female. So your search is done. LOL (not LCD-2 nice but it's very good)
You had the opposite experience as me in some ways. I started with the AKG Q701 as my very first full sized headphone. The width is insane. I enjoyed it for some time. I then added the HD650, D2000 with a smaller stages and didn't really mind it and realized the giant width is impressive for a short amount of time (a month or two) but not really helpful in enjoying music for me as I don't listen to pieces that need the width or depth. I DO think instrument seperation is important though.. I don't want them smearing into each other and imaging is neat to have as well. What I mean by imaging is instrument placement. But having width and depth is not critical for me. I'll take it if it's free like I said but I won't pay extra for it.