I have an older Lifeguard Quiet One that has been a good pump over the years, but is starting to get noisy & should probably be replaced. A LFS has a Quiet One for about $125. I'm seriously considering getting it, given how reliable the last 2 I've had have been. I'm also open to suggestion. I've heard you can't go wrong with Iwaki or Little Giant. I bought a Little Giant awhile back as a secondary pump. I got rid of it... too noisy. It had always been oiled & was never ran dry, just real noisy... Do Iwaki's need oil? I figure if I go Iwaki, I'm looking at a WMD 40 RLT (approx 750 gph). This is a return pump for a 120 gal tank. Any advice? My sump is drilled, so I need (well, prefer) to stay with an external.