I second the recommendation for any Shure IEMs or cans, and add Senn HD25-IIs for portable use (closed back, high sensitivity, small, light, short cord, built l

I second the recommendation for any Shure IEMs or cans, and add Senn HD25-IIs for portable use (closed back, high sensitivity, small, light, short cord, built like a tank, German :D ) and Beyerdynamic DT 770 Pros for awesome isolation and all-day comfort for your desk. I'm running a Behringer USB DAC (because it's the cheapest thing that has optical out) via TOSLINK into a Behringer Ultracurve DEQ2496 (using that as my DAC) running balanced XLR into a Henry Engineering Matchbox HD (found used on ebay for $30 mis-listed as "usb headphone amp" lololol -- they're ~$200 new) running unbalanced RCA into a SOHA tube amp that I built. All the stuff that requires mains power is on a OneAC isolater that is built to reduce hum on telecom gear. And that's my work desk :)