Need to know what is the quietest & highest GPH return pump

[lastlight]

There's no way any of the larger reeflo pumps are livingroom quiet. I'm not up to speed on the newer pumps but the largest red dragon is 900 plus dollars and likely won't flow quite as much. There are the even more expensive abyzz pumps. I don't think the tunze have near the flow you're after either...

Quiet and normal flow is pricey. Quiet and hammerhead equivalent flow is crazy pricey!

Your pump is not the gold version btw. also, to my knowledge the gold versions flow a bit more and aren't any quieter. The best you can do with reeflo pumps for noise is get the better baldor versions which yours is.