I like Oceanic’s Top offerings the EOS or Delta 4.2 that said since you didn’t list it as one of your choice... The Atomic is a fine reg and it’s service interval is every 2 years or 300 dives. As for purchasing online I disagree with Stu about LeisurePro as long as you have somewhere to get what you purchased serviced. That means either through a friendly Reg Tech, yourself, a local shop that is authorized for the brand or by shipping it when due. I’ve done business with LeisurePro and others and always been take care of properly. Many will tell you to take care of your local shops so they don’t disappear. I believe you should take care of those shops that earn your business with both pricing and service. Regardless of whether they are local or not. The next warning will be that you can’t get tanks filled online. I remind those that before the sport was popular enough to support shops, divers formed clubs and set up their own compressors.