I have two Reeflo Darts. I was going to stay with an external pump until the disaster happened and I downgraded to a 105, so I am just using a smaller internal pump now, a ViaAqua I've had for a few years that pushes around 800GPH~. The Reeflo pumps are going to give you the best bang for your buck in regards to flow versus power consumption, but the seals WILL leak at some point. I bought one used, seals leaked, and bought one new, seals leaked. Reeflo sent me new seals and an impeller for the new pump since it leaked out of the box. They were not 'loud' per se, but I could hear them. Used one was definitely louder than the new one though, might need new bearings. I've never had an internal pump I could hear and am glad I am back to one. Plus, external leads to more failure points for leaks, etc. I'm not even sure a Reeflo would be right for the flow running through a sump though, 3000GPH+ is too much going through the sump. They are probably best suited for closed loops or feed pumps for various other things (e.g. reactors, water change station, etc).