Chech. . . well there's a business model for you, buy cheap then dump it on ebay when it needs service. To choose a regulator, click on the "Forums" button at the top of the page, and scroll down till you reach equipment reviews. . . there are people, discussing every brand of regulator you can find. They all work, they probably all pass the navy requirements, and most exceed the navy requirements, at more that the navy will pay.
The ony variation between regulators in fit, is the mouthpiece. . . buy a comfortable mouth piece and a pack of zip ties, and they are all equal. Rent all of the gear and try it out in your dive sites. With your mouthpiece, they'll all feel about the same.
When you've rented several and made a choice, then talk to a local dealer see if he will work with you. . . you need a local dealer to buy air from, and to service the brands he carries. The day will come when you want to dive, and a leaking valve seat, can be serviced while you wait, or while it goes across the country. That's my experience. I like my local dive shop.
