The top three ranking is: Bose, Bose and Bose.
My company is in the process of installing Bose A20s in all our 737NGs. Quiet and comfortable, although some find the clamp pressure of the A20 a weeee bit on the + side after about 5 hours straight. You should try out different types to find the one that suits your needs. Remember, though, that you have to have a service letter for the a/c and an official approval from the regulatory agency for EACH aircraft and EACH headset (which have to be registered with the tech dept. with its own serial number). Your company will have to apply for both. I.e. you are not allowed to bring any ole' headset to work.
But then again, I never bothered to pay much attention to this since I am the one having to suffer The Devil's Orchestra the rest of my life because of some silly rule...
