I'm using Sennheiser HD380 pros. Fantastic headphones for monitoring and mixing, soon as I got them I gave them a listen and started noticing things I'd never noticed on tracks that Id heard a thousand times over.
The audio leakage can be pretty severe at high volumes but the accuracy makes up for it. I always do mixdowns using them just because my speakers can't match the detail and I got to keep at a low volume.
Also they're really comfortable and robust which is a big plus for headphones