HOG D1 with Classic 2nd stages. My wife and I each have a set of these for our single-tank rigs as well as a set each for our double-tank rigs. They work great. I have no idea how they compare with "high-end" regs.
HOG no longer makes the D1, but if they did, I might just buy more. I chose them over other options because an enthusiastic following on SB advised me that they were excellent value for the money, and the incremental benefits of more expensive regs just didn't (in their opinion) outweigh the good value of the HOGs. Back then (5-6 years ago?) they were priced even more competitively than HOG regs are today. And I knew that with us getting into tech diving we needed a bunch of regs. Now that I have learned to service them myself--something HOG encourages--I am even more happy with them. If I were to shop for regs today, with a similar mindset, I would look at Deep Six.