Plantronics
I've had one of the early GA models and am happy with it. All the electronics are in a box with integrated PTT not much bigger than the usual PTT that straps on the the yoke. An acoustic tube conveys the audio and mike via an earpiece -- watch the connection here. I took advantage of a kit to take molds of my ears which keeps the noise down a bit. These days, I'd check in with a hearing aid shop for ear molds or the replaceable foam tips other headsets are using.