Roger,
I can only relate my experiences with Mag pumps to drive one.
1. I had a 584 powered by a Mag 500 with the outlflow into the sump, where it got picked up by the sump pump. Worked okay, but not well enough. Some mist.
2. I tried a Mag 1800 with both a 584 and 384, same setup as #1. Worked better and kept the DC green, but still not enough. Some mist, but good dissolved c02. I noticed no real difference between the two models, but gave each one only 1 day, and then I went back to my Panworld 250 PS.
Experimentation is the key.
Good luck.