I worked on a design for electrostatic headphones 20 years while I was working at Paul Allen's Interval Research Lab. Our conclusion was that stats are the cheapest way to get high quality sound. The weak link being, of course, low distortion high voltage amplifiers. There is no reason stats have to be expensive. Right now my favorite rig is a set of Spritzer modded Koss stats and Stax Xh... less than a $K for both, so relatively inexpensive. @MrTechAgent when will we be able to buy these?