We've been here before, but aren't the current Pro4AA's updated internally over the 1970's models? When I went to look, the bargain priced new ones had long gone, so I went with what I knew and found some Sennheiser HD265's, which are broadly similar sonically to the Sony's 'everyone' was raving about here a few months ago (I haven't done a direct comparison though, but had a good listen to Alex's set a month or two ago - they're nice)
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me