Hi, I am preparing for a very loud set, and I am thinking of changing my HD26pro for something with more isolation from ambient noise.  I was thinking to go for HN-7506, but If there is something else out there with a good isolation, I would be very happy to hear.    Also,director and boom operators will be on the set exposed to water and rain and big fans for crating a wind ..., what would be recomedaton for this type of the closed headphones which are water resiste