Kevin,
Welcome to the forum.
Can you tell us a little more about yourself? We're a friendly lot round these parts.
Any of the surface applied membranes such as Kerdi, USG's grey fabric, Nobleseal, Dalseal, Hydroban, Hydrobarrier, Aquadefense, and their sister foam boards for the walls are all excellent products when applied properly. Often we blend manufacturers to get the results we want or the working qualities we want but that voids any sort of warranty. Bringing the shower waterproofing out onto the main bathroom floor (which also gets waterproofed) is a great idea.
But we don't need no steenken warranty