First serious thought on the pump.
Little Giant PE-2.5F-PW Pond Pump 566612, Little Giant Pumps
Looks around 13 foot max lift (only needed to prime) and keeps my 250 gph up to 9 ft lift which seems excessive.
I'd like to do a bit more measuring, to get to 15 foot max head I'd be looking at 150+ watts running current, 80 actually seems a bit much, but I think would be acceptable.
I'm thinking of putting a 5 gallon bucket in the bank perforated with 1/4" (maybe smaller?) drill holes as super corse screen, and some sort of ridgid wire screen inside the 5 gallon bucket to keep most stuff out with the pump screen after that.