Seconding the MDR 7506. They're optimized pretty hard for sound isolation, fidelity, and cost. The only kind of awkward thing about them is that they have a 9.8

Seconding the MDR 7506. They're optimized pretty hard for sound isolation, fidelity, and cost. The only kind of awkward thing about them is that they have a 9.8 foot coiled-up cord that's designed to give you a good chunk of slack between your head and what you're plugged into. Office listening doesn't really need this slack and it can get in the way or get tangled up sometimes. IMHO they're the best headphones at their price point. You can get better headphones, but you have to pay a lot for very small improvements. Cheaper headphones tend to be significantly worse.