The (durso) standpipe sizes seem more than sufficient - basically Bean Animal set-up? Knowing the tank dimensions, overflow weir size, what turnover rate are you shooting for would help for better equipment feedback.
Short of knowing more information, I think the internal overflow weir will be your bottleneck with turnover. The reason being is that drain the pipes are fairly large, and there are many good AC and DC pumps that can easily accommodate the turnover. But most of the time, you'll end up closing up the drains anyway create siphon and equal the water to your overflow, then down to your sump. Based on what your overflow can handle, you end up closing up the 1.5" pipes quite a bit. That's not necessary a bad thing, but just know that the pipes aren't the limiting factor.
I like DC pumps. I cannot think of any real disadvantages to that of AC pumps. There are inexpensive Jebao that people are had reliable results with. But there are more expensive ones from Blue Water, Waveline, Ecotech, Red Dragon. But then again, there are expensive AC ones too. DC pumps tend to advertise less usage cost and you can control with a module. I've heard 3 of the 4 brands I've listed and they are all quiet. I actually use the Wavelines both in sump and out of sump.