Zeagle 50D, hands down. Good, easy-breathing reg, sealed, and has the best warranty in the business. AND, it won't break the bank.
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I have and have had a lot of regulators. I keep coming back to my apeks tx-50/ds-4's. They may be a couple generations old, but they have not given me a reason to replace them. They work well in a variety of environments and handle cold water with ease. I bought them from simply scuba about 8 years ago, about $200.00 each rings a bell.... not too bad by today's standard.
So, next month in Roatan we're going to have six different regulators set up with duct tape over the second stage (keeping the buttons operable). The idea is that the regulators will be numbered not identified by brand. We've got two of them set up with some special performance things and the other four are tested to factory settings. Over six dives we'll have six divers try all of the regulators and vote on the 'best', 'worst', and 'prefer over the others'