Okay. So I am a sump, OFB, and return pump newbie. but I researched a lot. I decided to go with a 120 US gallon, 1600 GPH CS OFB. 1 1/2" pipe, mag drive 1800 with 6 feet of piping and a for 90 degrees to slow it to roughly 1100 GPH.
However, turns out no one around here (1 hour drive one way)...