A little late to the party here, but someone else mentioned the Sea Elite regs, and, having to equip a family of cold water divers (in doubles), the Sea Elite coverts have worked well for me. I would recommend shipping them to Diver's Supply for service, though, when the time comes. (Although anyone that can service Hog\Edge should be able to service Sea Elite.) Probably if you want a reg that anyone can service anywhere in the world the Scubapro Mk2 is the one that I have seen the most in rental fleets. I also have an old Conshelf that gets used a lot.