Update - I did one more 40mm version of a M-100, and it sounds amazing. But I think overall the 50mm I signed off on the other day is perfect and less fatiguing for longer listening sessions. Initially I sometimes think the 40mm is better, but after 20 minutes it just seems too "agressive" or staging isn't where I want it. After all, the original LP is analogous to mean "Long Play" or "Live Play" and this is our theme.
I say 50! So I think it's done guys, I am so thrilled with the sound - it's truly the best headphone I've ever listened to and I truly believe this sound straight out of an iPhone 4/4S unamped is a real steal at $299. So, goal accomplished and I'm coming home!