the best pumps that i have found are the ones sold by Hydro Farm through hydroponics stores for less then $30 they are designed for on and off operation and do about 250gph for $21 and 400gph for $26.95 the larger pumps are of course more; 800gph for $59. they are marketed under the brand name of Active Aqua. the pump is the heart of the system a couple bucks more for peace of mind.

with that being said, i wish i could find your deal here, it would be great to have for pumping out sumps and tanks or transfering water quickly.