I work on a response team at a sensitive industrial site, and am looking for some better earpiece/mic options than we currently have. It's a high noise environment in most areas, with a good bit of residual vibration from equipment. Our current earpieces are worn constantly for the duration of our 12 hour shifts, so we need something comfortable. I've tried TEA's bone mic, but it's right ear only, and still picks up all the background, not to mention it's a bit uncomfortable after a while. I need something which is comfortable, durable, at a MINIMUM water resistant, for use in the right or left ear, picks up minimum background noise, and if equipped with a boom, must be very unobtrusive. It must be also as compact as possible, and must be equipped with a push to talk switch, approximately 1.5-2 inches in diameter, preferably with a "doughnut" to prevent accidental activation. I'm looking to spend in the up to $650 range. Thanks in advance for your responses.