I've read this forum for years but for some reason only registered today. Maybe because the old headphone bug has bitten once again!
I used to listen exclusively though the Grado SR-225, but in recent years have favoured the "studio sound" of the AKG K271 MK II. I am quite active in field recording and have a set of Sennheiser HD25-1 II for that purpose.
Right now I am contemplating updating the K271. And I should really sell the Grados but they don't fetch what I think they are worth... so I hold onto them!