I second the posting about parts availibility. I know of a well know (technical regulator) that was the Cadillac of regs a few years ago that seemingly can't be serviced now due to a lack of parts. I could tell you what I dive, but that's like asking a waitress what she likes to eat. She is not the one going to EAT, you are! Set your price range and buy the most expensive regulator you can afford. This is your life support system, your life will depend on it. As you progress in your diving you will be more cognizant of what is a good feature, and useless fluff. The more do-dads on a dive regulator the more potential there is for failure or costly adjustments. Make sure that the first stage has enough ports (HP & LP) for what you are planning to do. Make sure the hose routing will work with your BC. Some ports are positioned so that hoses stick out and can make you un-streamlined. If you look at regulators from smaller manufacturers you'll start to note that they all look the same except for the second stage purge cap, examples (DiveRite and Salvo and HOG) all offer the same regulator from Tiawan. They are good regs, but almost all the same design & parts are generally available. The only other thing you should look at is if you want a yoke or DIN attachment. Yokes are used throughout the US and Caribbean. The rest of the world and most wreck, cave divers opted for DIN, while recreational divers prefer yoke. You'll hear about regs that breath great and some that don't. Breathing is a learned experience. As you get more underwater experience, and go deeper, you may find that a regulator is causing you to breath more forcefully. If it can't be adjusted to give you greater breathing ease then you need to shop for a reg that works at greater depths. This is a journey. Most of us, start with some basic gear and expand as we learn and find that our diving skills have improved and now we need better equipment. Brands are a matter of choice. Service is a must. Type of diving determines the type of regulator. Of course what you buy will be the BEST because it's yours.