Another vote for Raritan products.
We changed out the Jabsco electric toilets (affectionately called "growlers") with a Marine elegance (aft) and Sea Era (fwd). Both are extremely quiet, and have been trouble free.
The forward head remains sea water flush, and the aft is fresh water.
Peter- Marine Insurance Guru & tuna fishing addict!
1989 52' PT Overseas yachtfisher