There seems to be no reason to use steel pipe, with a small pump and short setting. I would use SCH 120 threaded PVC with integral bell end. It's cheaper than steel and a better product for this application since it won't corrode. I use almost exclusively Goulds pumps, and have had good success, but have lately tried F&W elite series that a local distributor has started carrying. They are a little more expensive, but have better pump curves in a lot of applications, are American made, and have Franklin motors.