Been using my HD280s for 3+ years now and am looking for another closed, semi-isolated, circumaural headphone to upgrade/add to my collection. Budget is ~$300 and I do not currently have an amp, so being easy to drive is a must (for now).
As for the types of music I listen to, some days its classical but others I play dubstep and rock. So after a lot of reading in the forums it looks like the best headphones for me are between the K550, GMP 8.35, and the SRH840, though, I am leaning towards the k550s. I'll be trying these out myself, but I'd like to hear your thoughts and suggestions.