Hey Slief,The JBJ requires a pump and I always advise using a slow dosing type pump with cheaper ato controllers just to be safe. I had the JBJ on a smaller tank and didn't trust it very much. The Tunze has a really good pump and a great controller. They aren't cheap though as you found out but they are extremely dependable.
Just another question. I have one baffle in my sump before the return pump. theoretically, that should keep the water level in the skimmer area constant, right? Do I need an ATO for consistency if I have the baffle?