SterlingDiver once bubbled...
...........you can't go wrong with ScubaPro regs.
I did. S550/MK16/R380. I bought the MK16 because I wanted a sealed first stage, and I'm not a fan of turrets.
Within five months I could not get the first stage to hold IP. I tore all three stages down and serviced them, but only made the problem worse. (All the while noting how "plastiky" they were inside, much to my surprise.)
...So I took them to a LDS who was better suited to service them. He promised me $15 per stage, plus parts. $140 (!) later I walked out with the system still refusing to hold IP. He'd tuned the first stage to have an IP of 120 psi... So it would take longer to freeflow. This was obviously not a fix. How frustrating that they thought they could "pull the wool over my eyes" like that. What was worse was the way I was treated, notably because I wore my primary on a long hose. I'll never go in that shop again, that's for sure. And my voice is loud in the local diving community... I can assure you that I attempt to persuade every local diver to avoid that shop.
Luckily, I'd purchased my regs from Leisurepro... (Yes, I hear your groans out there.) Thank GOD I bought my regs from Leisurepro! They accepted the regs back and gave me a full in-store credit... Which I used to purchase an Apeks ATX200 first and second. I followed it up with an ATX50 backup from Diveinn (great price, great service... Leisurepro does not sell an ATX50 second only).
I couldn't be happier. Great regs, great price, great service. They breathe like a dream, and they're solid as a rock. The first stage is simply a piece of art, and it's "directional" hose routing makes my rig even cleaner than it was.
Oh... And the internal components appear to be of much higher quality than the crap I got from Scubapro.
I hear that the MK25/S600 may be better, but unsealed regs don't last long in the local muddy rivers...