1. K1000 (the widest and perhaps the most natural, but they ARE speakers, after all) - still lovin' my pair
2. HE90 (the best VERTICAL soundstage, in my experience, bettering the K1000 in this regard; still my over-all favorite cans to this day)
3. HE60 (not nearly as amazing as the HE90, but VERY good)
4. SR-Omega (wide but not as natural as the Senns)
5. Omega II (wider than the original Ω, but not as pleasing as the original Ω, IMO).
Caveats:
I don't like the GS1000's soundstage
I've been away from the 'phone scene for awhile, so I haven't heard any of the new orthos, PS1000, HD800 or Beyer T1 at all (let alone spent quality time with 'em).