TL;DR: What's the best open portable headphones for about $100? I have an HD650, am looking for similar sound. Was an audiophile many years ago. Settled on an HD650 and a UM3X. I leave the UM3X at office for music enjoyment at work. But the problem is with it I cannot hear the outside (conversations, colleague calling me, etc.). So I need an open headphone at work to replace it. I'm looking for a similar sound (character wise, not quality of course) to HD650, and something easy to drive, for around $100. Ideally it's not too big and too fancy. Earphones don't work. It's probably just me, but I have yet to find a single pair that fits my ears. Bluetooth (are headphones with bluetooth good nowadays?) is a plus, but doesn't really matter. Thanks in advance!