Pilot 17-71
I have a Pilot Communications 17-71 and it is great. Fairly cheap too. The turboprop I fly is quite noisy and with the ANR working it is much more comfortable. Battery lasts about 6-8 days flying and it uses 9V rectangular ones. It is also very light, with the batteryin a separate box.
Whichever you get make sure it has good passive as well as active as when the battery goes you still need to be able to hear! You can add together the active and passive, so if you get a good ANR headset with poor passive, it will not be as good as one that has good noise attenuation with both. I highly reccomend ANR.