"You're gonna DIE, if you don't buy a Super, Improved, Scandium, Premier. . .whatever". If you buy new in the United States, you're gonna get a good regulator. There are so many sharks at the courthouse, nobody can afford to throw something together. How many bells and whistles, and high style fashion stripes you want to pay for is the big difference. Under the cover, most regulators are using designs that are as old as you. Within each company, adjustments can be made for comfort, or suitability to a special purpose. I've dove with two hose, and many of the single hose offerings. . . they're all good, and if maintained, safe. The old Dacors were built like a cannon ball. . . very dependable, heavier than most, and now parts are long gone. Someone else mentioned several long standing brands. . . this probably means you can parts in the future. Finding a trustworthy local dive shop will be your best protection for future maintainence.
Don't worry. . . They all blow bubbles.