I think, if I were going to buy regulators today, I'd buy the HOG/Edge regs. They seem to be well designed and the feedback from people who are using them has been good, although their track record isn't very long yet. But I'd buy them because of a policy decision made by the company, which is that any technical diver using these regs may take the regulator maintenance and repair course from the company, and openly purchase parts kits for the regs.
When I look at the 19 regs my husband and I own between us, I seriously wish I could service them. But they are various makes and models, and many are ScubaPro, which is the hardest company for which to get parts.