Tile and Wood
I don't want ANY carpet, and I don't want ANY linoleum.
I'd like to use some small 6 X 6 tiles in the entry area (just a small area, probably just over the width of the door, and in about the depth of the galley cabinet), and then tile the bathroom with 6 X 6 tiles. The tile will be held down with a hand mixed thin-set mortar, using an acrylic admix for strength, and standard grout (sealed, of course.) The rest of the floor would be a 1/4" thick engineered brazillian cherrywood floor. The wood will glued to the subfloor (or floated with vapor barrier under it.)
How much more weight do you think this is over what the original carpeting weighed? Will any of it require additional support?