Grado RS2e headphones to replace my ancient RS1s, which I managed to de-magnetise by storing them on top of some unshielded active speakers.
Initially they were very restricted, but after leaving them connected to a tuner for several days they opened up nicely.
They seem to be more natural then the old RS1s, and still very lively. I use them without a dedicated amplifier, though I have the appropriate Naim amp, connecting them to an Audiolab CDQ/tuner or an ATC integrated amp in my main system.
I guess I should be using a dedicated headphone amp, but understand that Grados are easy to drive and they seem to be very revealing and dynamic without.