So far this is my conclusion also, that the HD500 is more neutral but the LCD-2 is more pleasant to listen to. As I only intend to keep one, this leaves me in a quandry. A more neutral phone is always going to be more consistent recording to recording; a more euphonic phone is going to sound brilliant on some recordings and less so on others. Trouble is, the LCD-2 sounds brilliant on so many recordings that one can forgive those few recordings on which it sounds a little wayward--and by wayward I mean its colourations lead to a touch more listener fatigue than with the HE-500. Believe it or not but the LCD-2 Rev1 is actually capable of glare. A quiet glare, mind you, and not at the extreme treble but in the upper mids, with flutes and so forth. Probably this is related to its sounding more open than the HE-500. The HE-500 to me sounds like there's a lightly tinted perspex canopy over the orchestra; the LCD-2 removes that canopy but at the expense of the glare. It's all very subtle, and may be equipment related, but I can only speak as I hear.
And I don't have perfect pitch either, so there!
Buy the HE-400 to get both worlds and save yourself 100's of dollars?