For diving less than about 150`, I personally prefer to use Sherwood regs. I use a Maxamus but the Oasis also breathes well (Oasis is the warm water version). Sherwood regs are very reliable, enviromentally sealed, and very easy to repair. Look at the Sherwood web site to learn about all of the features to find the one to best suit your needs. Deeper than 150` I use a rebreather or Posiden regs. As far as the mist when inverted, most if not all will do that. Perhaps the Posiden Oden may be better because of the design. When the diver`s body is deeper than the regulator, the exhaust diaphrams tend to leak a little. I hope this helps.