We are remodeling and need to replace 1.6 gpf toilets to comply with 1.28 gpf water efficiency requirements of our city. I have looked at both Toto Guinevere and Kohler Memoirs in showrooms, but of course could not flush them to compare how loud the flush sound would be. Noisiness is not a feature that I ever see much discussion about, but all other things being equal, I would prefer a quieter flushing mechanism. Any views? Is there another brand or model I should consider?