ahhh, i like that setup Ccap... pretty close to the way i did mine on my 75... only i didnt have a level controller, i just used a timer to run the pump(like your powerhead) and then i had another float valve in the sump at the end of that pump... so the pump only ran for 2 min 8 times a day, every 3 hours... and the float valve actually controlled the level...
not the "best" but it worked and i was able to use mostly junk i had around here...