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Most of the headphones suggested here are either not portable enough for my needs or are over my budget. I ended up going with the Sennheiser PX 100-ii and I'm loving it so far! Great sound and soundstage, and it's very portable. My only complaint is that the clamping force is a bit high for my big head, so I have to remove it for like 10 minutes every 2 hours or so.