I've heard these types of discussions ad infinitum lately and outside of getting the opportunity to hear a lot of these individual cans in an appropriately amp'd and sourced environment with my own music, I, like many others, have to go off the possibly (likely)subjective experiences of others who've heard them. Not necessarily that that's always a bad thing, but as we've clearly determined time and time again, what amounts to "basshead" phones for one person and another are clearly different depending on the usage.
For me, when I judge the bass quantity, accuracy, tightness, impact, smoothness, all these variables, I'm usually looking at it through the lens of the type of music where excellent bass is so essential for the music to sound the way it's intended. For me there's no better lens to observe bass than via the Burial, "Untrue" album and other music in the same vein. Others, and possibly many others, might just label a set of headphones "basshead" cans simply because of the way the bass guitar sounds on their Rolling Stones album or how visceral a bassline might sound on a Diana Krall song. Now don't get me wrong - I'm not saying those aren't good markers to look at and judge a pair of headphones bass capability. Just that although they may sound great and have definitively better bass characteristics than another set of cans, that doesn't mean they're going to sounds the way people like myself would hope they sound when we hear that type of music which places so much more emphasis on bass.
Sorry for the long-winded post. Didn't mean for it to be so long but it just got away from me a bit. Have enjoyed the thread
Edit- Oh one more thing. In my book you really can't do much better than Denon D2000s (properly amp'd and sourced) for the money. I have they and the D5000s and am still waiting for the magical cans to come along that have everything I want across the spectrum. I can dream....