If there are Staples/Office Depot/Office Max near you, stop by and try the replacement keyboards, see which one has the combination of touch and quietness you prefer.
Back in the 1980's, when I was a traveling developer, I had an NCR keyboard, made in Germany, with separate physical switches for each key, and a switch on the back to be compatible with XT and AT. It was quiet, too! I hope you'll get some recommendations here for current soft touch and quiet models.
Fred Wagner