Any water pump with require water flow is good. Mag 7 is good pump. When selecting a pump make sure that the pump can operate both submerged and an in-line.
My water level in the sump is about 1/2 inch above the pump at ideal condition. But usually the water level always falls. If your pump isn't a in-line and pump isn't fully submerged at all time, your are reducing the life of the pump.
Rohn