I also have a Sequence pump (750 series) on my 120 with 30 gal sump. The intake is a little large, requiring a 2" intake, but it is one sweet pump. Probably the quietest one I've ever heard, and for the power they have, the wattage used is really low. Mine's only 110 watts at 2400 gph, 4 ft. head. Many people praise their high quality as well - it's built very solid. They aren't the cheapest, but they aren't the most expensive. They make pond pumps as well, so make sure yours comes with saltwater seals (I believe all the ReefFlo series do).